Obsessive-Compulsive and Related Disorders — MCQs

A 12-year-old boy presents with unusual behaviors, including spending over two hours in the shower due to a preoccupation with 'germs' and a compulsive need to wash repeatedly, despite recognizing the irrationality of these actions. He also exhibits repetitive checking behavior, such as checking his bag for a pen every five minutes, which significantly impacts his ability to complete exams on time. What is the most likely diagnosis?

Q28Easy

A person has recurrent intrusive thoughts which he thinks are irrational and wants to stop is:

Q29Medium

In obsessive-compulsive disorder, which of the following is NOT a commonly used medication?

Q30Easy

A feeling of uncertainty and an excessive sense of responsibility is characteristic of which condition?

Obsessive-Compulsive and Related Disorders Indian Medical PG Practice Questions and MCQs

Question 21: Which of the following Obsessive-Compulsive and Related Disorders carries the worst prognosis for treatment?

A. Pathological doubt
B. Contamination
C. Hoarding disorder (Correct Answer)
D. Obsessive thought disorder

Explanation: **Explanation:** **Hoarding Disorder** is recognized as having the poorest prognosis among the Obsessive-Compulsive and Related Disorders (OCRDs). Unlike typical OCD, hoarding is characterized by a persistent difficulty discarding possessions regardless of value, leading to extreme clutter. The poor prognosis is primarily due to **poor insight** (most patients do not perceive their behavior as problematic), high rates of treatment non-compliance, and a lack of motivation to change. Furthermore, hoarding symptoms are notoriously resistant to standard Pharmacotherapy (SSRIs) and traditional Cognitive Behavioral Therapy (CBT), often requiring specialized, long-term interventions. **Analysis of Incorrect Options:** * **Pathological Doubt (Option A):** This is a common symptom of OCD (e.g., "Did I lock the door?"). While distressing, it typically responds well to Exposure and Response Prevention (ERP) and SSRIs. * **Contamination (Option B):** This is the most common obsession in OCD. It generally carries a **good prognosis** because the distress is high, leading to better treatment seeking and a robust response to ERP. * **Obsessive Thought Disorder (Option D):** Pure obsessional thoughts (without overt compulsions) can be challenging, but they still show significantly better response rates to pharmacological and psychological interventions compared to hoarding. **High-Yield Clinical Pearls for NEET-PG:** * **Epidemiology:** Hoarding disorder is more common in older adults (symptoms often start in adolescence but worsen with age). * **Neurobiology:** Hoarding is associated with distinct activity patterns in the **anterior cingulate cortex** and **orbitofrontal cortex** compared to typical OCD. * **Treatment:** The treatment of choice is a specialized form of CBT; however, the overall response rate remains lower than other OCRDs. * **Insight:** In the DSM-5, "absent insight/delusional beliefs" is a specifier most frequently associated with Hoarding Disorder.

Question 22: All of the following are signs of poor prognosis in obsessive-compulsive disorder (OCD) except?

A. Good social adjustment (Correct Answer)
B. Coexisting major depression
C. Childhood onset
D. Bizarre compulsions

Explanation: In Psychiatry, understanding the prognostic factors of Obsessive-Compulsive Disorder (OCD) is high-yield for competitive exams like NEET-PG. ### **Explanation** **OCD** is generally a chronic, waxing-and-waning condition. Prognosis is determined by the severity of symptoms, age of onset, and comorbid conditions. 1. **Why Option A is Correct:** **Good social adjustment** (and good premorbid personality) is a **favorable prognostic factor**. Patients who maintain strong social ties and functional capacity generally respond better to treatment and have higher rates of remission. 2. **Why Other Options are Incorrect (Signs of Poor Prognosis):** * **B. Coexisting Major Depression:** Comorbidity, especially with depression or personality disorders, complicates treatment and increases the risk of chronicity. * **C. Childhood Onset:** Early onset (pediatric OCD) is often associated with a more severe clinical course, higher genetic loading, and a higher likelihood of tic disorders. * **D. Bizarre Compulsions:** The presence of unusual or "bizarre" compulsions often indicates poor insight or a shift toward the psychotic spectrum, making the disorder more resistant to standard SSRI/CBT therapy. ### **High-Yield Clinical Pearls for NEET-PG** * **Good Prognosis Factors:** Late onset, short duration of symptoms, presence of a precipitating event, and episodic nature of symptoms. * **Poor Prognosis Factors:** Yielding to compulsions (not resisting), symmetry obsessions, presence of tics, and delusional intensity of beliefs (poor insight). * **Treatment of Choice:** Cognitive Behavioral Therapy (specifically **Exposure and Response Prevention - ERP**) + **SSRIs** (e.g., Fluoxetine, Fluvoxamine). * **Drug of Choice (TCA):** Clomipramine (most potent but second-line due to side effects).

Question 23: Which of the following characterizes Obsessive-Compulsive Disorder (OCD)?

A. Obsessions of contamination are rare.
B. Buspirone is used to augment therapy.
C. The patient readily discusses the symptoms.
D. Onset typically occurs in late adulthood. (Correct Answer)

Explanation: **Explanation:** **Correct Answer: D. Onset typically occurs in late adulthood.** *(Note: In clinical psychiatry, the typical onset of OCD is actually in late adolescence or early adulthood. However, based on the provided key marking Option D as correct, it is important to note that while the peak onset is young, cases can manifest or be diagnosed later. **Academic Note:** Standard textbooks like Kaplan & Sadock state the mean age of onset is ~20 years; Option D is traditionally considered "incorrect" in most medical literature, but if following a specific exam key, it implies the chronic nature of the disorder extending into later life.)* **Analysis of Options:** * **A. Obsessions of contamination are rare:** This is **incorrect**. Contamination is the **most common** obsession in OCD, often followed by pathological doubt. * **B. Buspirone is used to augment therapy:** While Buspirone is an anxiolytic, it is **not** a first-line or standard augmentation strategy for OCD. The preferred augmentation for treatment-resistant OCD typically involves atypical antipsychotics (e.g., Risperidone) or adding Clomipramine to an SSRI. * **C. The patient readily discusses the symptoms:** This is **incorrect**. OCD is often associated with significant shame and secrecy. Patients frequently hide their rituals for years before seeking help, making it an "ego-dystonic" but private condition. **High-Yield Clinical Pearls for NEET-PG:** * **First-line Treatment:** SSRIs (at higher doses than used for depression) and Cognitive Behavioral Therapy (CBT) specifically **Exposure and Response Prevention (ERP)**. * **Gold Standard Drug:** **Clomipramine** (a TCA) is the most effective but often second-line due to its side-effect profile. * **Neurobiology:** Associated with hyperactivity in the **Orbitofrontal Cortex, Anterior Cingulate Cortex, and Caudate Nucleus** (Cortico-striato-thalamo-cortical circuit). * **Gender:** In children, it is more common in boys; in adults, the gender ratio is roughly equal.

Question 24: What is the drug of choice for obsessive-compulsive disorder?

A. Sertraline (Correct Answer)
B. Amoxapine
C. Hydroxyzine
D. Alprazolam

Explanation: **Explanation:** **Obsessive-Compulsive Disorder (OCD)** is primarily managed through a combination of Pharmacotherapy and Cognitive Behavioral Therapy (specifically Exposure and Response Prevention). **Why Sertraline is Correct:** The first-line pharmacological treatment for OCD is **Selective Serotonin Reuptake Inhibitors (SSRIs)**. Sertraline is a potent SSRI that increases synaptic serotonin levels, which is crucial since OCD is linked to serotonergic dysregulation in the cortico-striato-thalamo-cortical (CSTC) circuits. While multiple SSRIs (Fluoxetine, Fluvoxamine, Paroxetine) are effective, Sertraline is frequently preferred due to its favorable safety profile and minimal drug-drug interactions. **Why the Other Options are Incorrect:** * **Amoxapine:** This is a tetracyclic antidepressant with antipsychotic properties (D2 blockade). It is not a first-line treatment for OCD and is generally reserved for psychotic depression. * **Hydroxyzine:** An H1-receptor antagonist (antihistamine) used for acute anxiety or pruritus. It has no efficacy in treating the core symptoms of OCD. * **Alprazolam:** A benzodiazepine used for panic disorder and generalized anxiety. While it may provide temporary relief from OCD-related anxiety, it does not treat the underlying obsessions or compulsions and carries a risk of dependence. **High-Yield Clinical Pearls for NEET-PG:** * **Higher Doses:** OCD typically requires higher doses of SSRIs than those used for Major Depressive Disorder. * **Delayed Response:** Clinical improvement in OCD often takes longer to manifest (8–12 weeks) compared to depression (2–4 weeks). * **Clomipramine:** A Tricyclic Antidepressant (TCA) that is the most potent anti-obsessional drug; however, it is considered **second-line** due to its significant side-effect profile (anticholinergic effects, cardiotoxicity). * **Refractory Cases:** For treatment-resistant OCD, low-dose atypical antipsychotics (e.g., Risperidone) can be used as an augmentation strategy.

Question 25: All of the following statements regarding obsessions are true EXCEPT:

A. Obsessions persist despite resistance by the patient.
B. Obsessions are ego-dystonic.
C. Obsessions are a disorder of thought content. (Correct Answer)
D. Obsessions can be seen in schizophrenia.

Explanation: ### Explanation **1. Why Option C is the correct answer (The "EXCEPT" statement):** In psychopathology, obsessions are classified as a **disorder of the possession of thought**, not thought content. The defining feature of an obsession is that the patient recognizes the thought as their own (internal origin) but feels it is being forced upon them. Disorders of thought content include delusions, phobias, and preoccupations. **2. Analysis of Incorrect Options:** * **Option A (Persist despite resistance):** This is a hallmark of OCD. Patients typically recognize the thoughts as irrational or excessive and make active attempts to ignore, suppress, or neutralize them with some other thought or action (compulsions). * **Option B (Ego-dystonic):** Obsessions are ego-dystonic, meaning they are inconsistent with the individual's self-image, beliefs, and values. This causes significant distress, unlike ego-syntonic conditions (e.g., OCPD or Delusions) where the patient views the thoughts as appropriate. * **Option D (Seen in schizophrenia):** While primarily associated with OCD, "obsessive-compulsive symptoms" (OCS) can occur in up to 25% of patients with schizophrenia. When both criteria are fully met, it is sometimes referred to as Schizo-obsessive disorder. **3. NEET-PG High-Yield Pearls:** * **Obsessions:** Disorder of **Possession** (Sense of Agency). * **Delusions:** Disorder of **Content**. * **Thought Insertion:** Disorder of **Possession** (Patient believes thoughts are alienated/external). * **OCD vs. OCPD:** OCD is ego-dystonic (distressing); OCPD (Personality Disorder) is ego-syntonic (perceived as correct/ideal). * **First-line Treatment:** SSRIs (at higher doses than for depression) and CBT (Exposure and Response Prevention - ERP).

Question 26: Which drug is most useful in the treatment of obsessive-compulsive disorder?

A. Flucytosine
B. Fluoxetine (Correct Answer)
C. Fluorouracil
D. Finasteride

Explanation: **Explanation:** **Obsessive-Compulsive Disorder (OCD)** is primarily managed through a combination of Pharmacotherapy and Cognitive Behavioral Therapy (CBT), specifically Exposure and Response Prevention (ERP). 1. **Why Fluoxetine is correct:** The first-line pharmacological treatment for OCD consists of **Selective Serotonin Reuptake Inhibitors (SSRIs)**. Fluoxetine is a potent SSRI that increases synaptic serotonin levels, which is crucial in modulating the orbitofrontal-striatal circuitry implicated in OCD. It is important to note that in OCD, SSRIs are typically used at **higher doses** than those required for depression (e.g., 40–80 mg of Fluoxetine). 2. **Why the other options are incorrect:** * **Flucytosine:** An antifungal medication used primarily in systemic candidiasis or cryptococcal meningitis. * **Fluorouracil (5-FU):** A cytotoxic chemotherapy agent (antimetabolite) used in treating various cancers (e.g., colorectal, breast). * **Finasteride:** A 5-alpha-reductase inhibitor used for Benign Prostatic Hyperplasia (BPH) and male pattern baldness. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice (DOC):** SSRIs (Fluoxetine, Fluvoxamine, Sertraline, Paroxetine) are the first-line agents. * **Most Effective Drug:** **Clomipramine** (a TCA) is often considered the most efficacious drug for OCD due to its potent serotonergic activity, but it is second-line due to its side-effect profile (anticholinergic effects, cardiotoxicity). * **Treatment Duration:** OCD requires a longer trial (8–12 weeks) to see a clinical response compared to depression (2–4 weeks). * **Refractory Cases:** Deep Brain Stimulation (DBS) targeting the **ventral striatum** or **internal capsule** may be considered.

Question 27: A 12-year-old boy presents with unusual behaviors, including spending over two hours in the shower due to a preoccupation with 'germs' and a compulsive need to wash repeatedly, despite recognizing the irrationality of these actions. He also exhibits repetitive checking behavior, such as checking his bag for a pen every five minutes, which significantly impacts his ability to complete exams on time. What is the most likely diagnosis?

A. Specific phobia for germs
B. Autism Spectrum Disorder
C. Obsessive Compulsive Disorder (Correct Answer)
D. Cyclothymia

Explanation: ### Explanation The correct diagnosis is **Obsessive-Compulsive Disorder (OCD)**. **Why OCD is correct:** The patient demonstrates the classic triad of OCD: **Obsessions** (intrusive, distressing thoughts about 'germs'), **Compulsions** (repetitive behaviors like excessive washing and checking), and **Insight** (recognizing the irrationality of the actions). In children, OCD often presents with washing and checking rituals. The diagnosis requires these symptoms to be time-consuming (taking >1 hour/day) or cause significant functional impairment, both of which are evident in this boy’s two-hour showers and inability to finish exams. **Why the other options are incorrect:** * **Specific Phobia:** While there is a fear of germs, phobias involve *avoidance* of the stimulus rather than ritualistic, repetitive compulsions to neutralize the anxiety. * **Autism Spectrum Disorder (ASD):** ASD involves deficits in social communication and restricted, repetitive patterns of behavior. However, the patient’s insight into the irrationality of his actions and the specific nature of the germ-related anxiety point toward OCD rather than the developmental deficits seen in ASD. * **Cyclothymia:** This is a chronic mood disorder characterized by numerous periods of hypomanic and depressive symptoms. It does not involve obsessions or compulsions. **High-Yield Clinical Pearls for NEET-PG:** * **First-line Treatment:** Cognitive Behavioral Therapy (CBT) with **Exposure and Response Prevention (ERP)**. * **Pharmacotherapy:** **SSRIs** (e.g., Fluoxetine, Sertraline) are the first-line drugs. **Clomipramine** (TCA) is highly effective but usually second-line due to side effects. * **PANDAS:** In children, sudden-onset OCD following a Group A Streptococcal infection should raise suspicion for Pediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcal Infections. * **Ego-dystonic:** OCD symptoms are typically "ego-dystonic" (the patient views them as alien/irrational), unlike OCPD which is "ego-syntonic."

Question 28: A person has recurrent intrusive thoughts which he thinks are irrational and wants to stop is:

A. Compulsion
B. Obsession (Correct Answer)
C. Delusion
D. Hallucination

Explanation: ### Explanation **Correct Option: B. Obsession** The clinical scenario describes the classic definition of an **obsession**. In psychiatry, obsessions are defined by four key characteristics: 1. **Intrusive and Recurrent:** They enter the mind involuntarily. 2. **Internal Origin:** The patient recognizes these thoughts as products of their own mind (unlike thought insertion). 3. **Irrational/Ego-dystonic:** The patient finds them senseless, unacceptable, or inconsistent with their self-image. 4. **Resistance:** The patient attempts to ignore, suppress, or neutralize them. **Why other options are incorrect:** * **A. Compulsion:** These are repetitive **behaviors** (e.g., hand washing) or mental acts (e.g., counting) performed in response to an obsession to reduce anxiety. While obsessions are thoughts, compulsions are the actions taken to alleviate the distress caused by those thoughts. * **C. Delusion:** A fixed, false belief that is out of keeping with the patient’s cultural and educational background. Crucially, delusions are **ego-syntonic** (the patient believes they are true and does not try to resist them). * **D. Hallucination:** A sensory perception in the absence of an external stimulus (e.g., hearing voices). This is a disorder of perception, not a disorder of thought content. ### NEET-PG Clinical Pearls: * **Ego-dystonic vs. Ego-syntonic:** Obsessions are ego-dystonic (distressing/unwanted), whereas delusions and OCPD (Personality Disorder) traits are typically ego-syntonic. * **Insight:** In OCD, insight is usually preserved (the patient knows the thoughts are irrational), which distinguishes it from psychosis. * **First-line Treatment:** Selective Serotonin Reuptake Inhibitors (SSRIs) and Cognitive Behavioral Therapy (CBT) using **Exposure and Response Prevention (ERP)**. * **Brain Imaging:** OCD is associated with structural/functional changes in the **Orbitofrontal cortex, Anterior Cingulate Cortex, and Caudate nucleus** (Cortico-striato-thalamo-cortical circuit).

Question 29: In obsessive-compulsive disorder, which of the following is NOT a commonly used medication?

A. Clomipramine
B. Haloperidol (Correct Answer)
C. Sertraline
D. Carbamazepine

Explanation: ### Explanation The primary pharmacological management of **Obsessive-Compulsive Disorder (OCD)** involves modulating the serotonergic system. **Why Haloperidol is the correct answer:** **Haloperidol** is a typical (first-generation) antipsychotic that acts primarily as a D2 receptor antagonist. It is **not** a first-line or commonly used medication for OCD. While low-dose antipsychotics (like Risperidone or Haloperidol) may be used as *augmentation* therapy in treatment-resistant cases—particularly when comorbid tics are present—they are not standard monotherapy for OCD. **Analysis of other options:** * **Clomipramine (Option A):** A Tricyclic Antidepressant (TCA) that is the "gold standard" for OCD due to its potent serotonin reuptake inhibition. It is often reserved for second-line use due to its side-effect profile compared to SSRIs. * **Sertraline (Option C):** A Selective Serotonin Reuptake Inhibitor (SSRI). SSRIs (including Fluoxetine, Fluvoxamine, and Paroxetine) are the **first-line** pharmacological treatments for OCD. * **Carbamazepine (Option D):** While not a primary treatment, anticonvulsants/mood stabilizers are sometimes explored in refractory cases. However, in the context of standard NEET-PG questions, Haloperidol is the "most" incorrect as it lacks primary anti-obsessional properties. *(Note: In some clinical contexts, Carbamazepine is also not standard; however, Haloperidol's role is strictly limited to augmentation, making it the classic distractor in this question set).* **High-Yield Clinical Pearls for NEET-PG:** * **First-line treatment:** SSRIs (at higher doses than those used for depression). * **Most effective drug:** Clomipramine (TCA). * **Duration of treatment:** Usually 1–2 years before attempting to taper. * **Non-pharmacological DOC:** Exposure and Response Prevention (ERP), a form of CBT. * **Neurobiology:** Associated with hyperactivity in the **Orbitofrontal Cortex**, Anterior Cingulate Gyrus, and Caudate Nucleus (Cortico-striato-thalamo-cortical circuit).

Question 30: A feeling of uncertainty and an excessive sense of responsibility is characteristic of which condition?

A. Generalized anxiety disorder
B. Obsessive-compulsive disorder (Correct Answer)
C. Phobia
D. Personality disorder

Explanation: **Explanation:** The core psychopathology of **Obsessive-Compulsive Disorder (OCD)** involves a pathological sense of **uncertainty (pathological doubt)** and an **inflated sense of responsibility**. Patients often feel that they have the power to cause or prevent a catastrophe, leading to the "responsibility appraisal" theory. This drives the "doubting" nature of the disorder (e.g., "Did I lock the door?"), where the patient feels personally responsible for any potential negative outcome, necessitating repetitive compulsions to neutralize the perceived threat. **Analysis of Options:** * **Generalized Anxiety Disorder (GAD):** Characterized by "free-floating" anxiety and excessive worry about everyday life events (finances, health), but it lacks the specific intrusive obsessions and the ritualistic compulsions driven by a sense of personal responsibility. * **Phobia:** Involves an irrational fear of a specific object or situation (e.g., heights, spiders) leading to avoidance. It does not typically involve a sense of responsibility for preventing harm through rituals. * **Personality Disorder:** While Obsessive-Compulsive Personality Disorder (OCPD) involves perfectionism and rigidity, it is **ego-syntonic**. OCD is **ego-dystonic**, and the excessive sense of responsibility is a hallmark of the anxiety-driven obsessional state. **Clinical Pearls for NEET-PG:** * **Pathological Doubt:** The most common clinical presentation of OCD is obsessions of doubt followed by checking compulsions. * **Ego-dystonic:** The patient recognizes the thoughts as their own but finds them irrational and distressing. * **First-line Treatment:** SSRIs (at higher doses than for depression) and Cognitive Behavioral Therapy (specifically **Exposure and Response Prevention - ERP**). * **Neurobiology:** Associated with hyperactivity in the **Cortico-Striato-Thalamo-Cortical (CSTC) circuit** (specifically the orbitofrontal cortex and anterior cingulate).

Practice by Chapter

Obsessive-Compulsive Disorder

Practice Questions

Body Dysmorphic Disorder

Practice Questions

Hoarding Disorder

Practice Questions

Trichotillomania

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Excoriation (Skin-Picking) Disorder

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Tic Disorders

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Tourette's Syndrome

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Pharmacotherapy for OCD and Related Disorders

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Cognitive-Behavioral Therapy for OCD

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Neurosurgical Approaches

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OCD in Children and Adolescents

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OCD Spectrum Disorders

Practice Questions

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