Non-Communicable Diseases — MCQs

Non-Communicable Diseases Indian Medical PG Practice Questions and MCQs

Question 151: What is the Quetelet index?

A. Weight / Height
B. Height / Weight
C. Weight / (Height squared) (Correct Answer)
D. Height / (Weight squared)

Explanation: **Explanation:** The **Quetelet Index**, universally known as the **Body Mass Index (BMI)**, is the most widely used anthropometric indicator to assess nutritional status and classify obesity in adults. It was developed by Adolphe Quetelet in the 19th century. **1. Why Option C is Correct:** The formula for the Quetelet Index is **Weight (kg) / Height (m²)**. This mathematical relationship is used because weight increases in proportion to the square of the height in healthy adults, providing a standardized measure of "body fatness" that is independent of height. **2. Why Other Options are Incorrect:** * **Option A & B:** Simple ratios of weight and height do not account for the three-dimensional nature of body mass and fail to correlate accurately with body fat percentage. * **Option D:** Dividing height by the square of weight has no physiological or clinical basis in nutritional assessment. **3. High-Yield Clinical Pearls for NEET-PG:** * **WHO Classification of BMI:** * Underweight: <18.5 kg/m² * Normal: 18.5 – 24.9 kg/m² * Overweight: 25.0 – 29.9 kg/m² * Obesity: ≥30.0 kg/m² * **Asian-Indian Specific Cut-offs:** Due to a higher risk of metabolic syndrome at lower BMIs, the revised criteria for Indians are: Overweight (23–24.9 kg/m²) and Obesity (≥25 kg/m²). * **Ponderal Index:** Another index used primarily in pediatrics/neonatology, calculated as **Weight / Height³**. * **Corpulence Index:** Also known as Rohrer's Index (Weight/Height³). * **Limitation:** BMI does not distinguish between muscle mass and fat mass (e.g., athletes may have a high BMI but low body fat).

Question 152: In which of the following conditions is Tetanus most commonly noticed?

A. Burn cases
B. Wounds contaminated with fecal matter (Correct Answer)
C. Open fracture
D. Gunshot wounds

Explanation: **Explanation:** **Why Option B is Correct:** Tetanus is caused by *Clostridium tetani*, an anaerobic, spore-forming Gram-positive bacillus. The primary reservoir for these spores is the **intestines of animals and humans**, from which they are excreted in feces into the soil. Consequently, any wound contaminated with **fecal matter** or soil containing manure has the highest concentration of spores. This creates the most significant risk for the introduction of the pathogen into the body, especially if the wound environment is anaerobic. **Analysis of Incorrect Options:** * **A. Burn cases:** While burns (especially deep ones) create necrotic tissue that favors anaerobic growth, they are less likely to be the *primary* source of spores compared to direct fecal contamination. * **C. Open fracture:** These are "tetanus-prone" wounds due to tissue devitalization and potential soil contact, but they are statistically less common as a specific source than general contaminated wounds. * **D. Gunshot wounds:** These provide the ideal anaerobic environment (deep, narrow tracts with tissue necrosis), but the "most common" association remains with environmental/fecal contamination of the injury site. **Clinical Pearls for NEET-PG:** * **The Toxin:** Tetanospasmin (an exotoxin) blocks the release of inhibitory neurotransmitters (**GABA and Glycine**) from Renshaw cells in the spinal cord, leading to spastic paralysis. * **First Sign:** Trismus (lockjaw) is the most common presenting symptom. * **Riskiest Wound:** A "tetanus-prone" wound is typically >6 hours old, >1 cm deep, contaminated, or containing devitalized tissue. * **Incubation Period:** Usually 3–21 days; a shorter incubation period generally indicates a poorer prognosis. * **Neonatal Tetanus:** Known as the "8th-day disease," usually caused by using unsterile instruments to cut the umbilical cord.

Question 153: According to the latest WHO guidelines for the treatment of leprosy, what is the recommended duration for paucibacillary leprosy?

A. Two years or until negative slit smear, whichever is longer, for multibacillary leprosy.
B. Lifelong treatment.
C. Six months treatment for paucibacillary leprosy. (Correct Answer)
D. Treatment duration is not specified.

Explanation: **Explanation:** The treatment of Leprosy (Hansen’s Disease) is based on the **WHO Multi-Drug Therapy (MDT)** protocol, which categorizes patients into Paucibacillary (PB) and Multibacillary (MB) based on the number of skin lesions and nerve involvement. **Why Option C is correct:** According to the latest WHO guidelines, **Paucibacillary (PB) leprosy** (1–5 skin lesions, negative slit-skin smear) is treated with a 2-drug regimen (Rifampicin and Dapsone) for a duration of **6 months**, to be completed within a maximum period of 9 months. This duration is sufficient to eliminate the low bacterial load in PB cases and prevent relapse. **Analysis of Incorrect Options:** * **Option A:** This describes an outdated practice. Current WHO MDT for **Multibacillary (MB) leprosy** is a fixed duration of **12 months**, regardless of smear results. Treatment is no longer continued until "smear negativity" to ensure uniformity and simplify logistics. * **Option B:** Leprosy is a curable bacterial infection caused by *Mycobacterium leprae*. Lifelong treatment is never indicated; fixed-duration MDT is the global standard. * **Option D:** WHO provides very specific, evidence-based durations for MDT to prevent the emergence of drug resistance and ensure high compliance. **High-Yield Clinical Pearls for NEET-PG:** * **PB Regimen (6 months):** Rifampicin (600 mg once monthly, supervised) + Dapsone (100 mg daily, self-administered). * **MB Regimen (12 months):** Rifampicin (600 mg monthly) + Clofazimine (300 mg monthly + 50 mg daily) + Dapsone (100 mg daily). * **Single Lesion PB (SLPB):** Previously treated with ROM (Rifampicin, Ofloxacin, Minocycline), but current WHO guidelines recommend the standard 6-month PB regimen for all PB cases. * **Accompanied MDT (A-MDT):** Providing the full course of treatment at the first visit to improve compliance in migratory populations.

Question 154: What is the commonest cancer in males?

A. Lung
B. Prostate (Correct Answer)
C. Testis
D. Oral cavity

Explanation: ### Explanation The correct answer is **Prostate cancer**. **1. Why Prostate is Correct:** According to global epidemiological data (GLOBOCAN), **Prostate cancer** is the most frequently diagnosed cancer among men in the majority of developed countries and is the most common cancer in males worldwide when excluding non-melanoma skin cancers. While incidence rates vary geographically, it remains the leading site for new cancer cases in males globally due to increased screening (PSA testing) and an aging population. **2. Analysis of Incorrect Options:** * **Lung Cancer (Option A):** While Lung cancer is the **leading cause of cancer-related mortality** (deaths) in males worldwide, it ranks second to prostate cancer in terms of overall incidence (new cases). * **Testis (Option C):** Testicular cancer is relatively rare. It is significant only as the most common malignancy in young men (ages 15–35), but it does not lead in overall male population statistics. * **Oral Cavity (Option D):** Oral cancer is highly prevalent in specific regions like **India** due to tobacco and betel nut chewing habits. In the Indian context, Lip and Oral Cavity cancer often ranks as the #1 cancer in males, but globally, Prostate cancer takes precedence. **3. High-Yield Clinical Pearls for NEET-PG:** * **Global (Males):** Most common incidence = **Prostate**; Most common mortality = **Lung**. * **India (Males):** Most common incidence = **Lip/Oral Cavity** (followed by Lung). * **Global (Females):** Most common incidence and mortality = **Breast**. * **India (Females):** Most common incidence = **Breast** (Cervix is now #2 in most urban registries). * **Overall (Both sexes):** Breast cancer has recently overtaken Lung cancer as the most commonly diagnosed cancer globally.

Question 155: Which of the following conditions typically does NOT present with both fever and rash?

A. Measles
B. Rabies (Correct Answer)
C. Rubella
D. Chickenpox

Explanation: **Explanation:** The correct answer is **Rabies**. In Community Medicine and Infectious Diseases, the "Fever with Rash" complex is a classic clinical presentation for many viral exanthems, but Rabies is a distinct neurological infection. **1. Why Rabies is the correct answer:** Rabies is an acute, progressive viral encephalomyelitis. While it may begin with a prodromal phase of fever, headache, and malaise, its hallmark clinical features are neurological—specifically **hydrophobia, aerophobia, photophobia, and excessive salivation**. It does **not** present with a characteristic skin rash. The primary skin finding in rabies is localized paresthesia or tingling at the site of the bite, not a generalized exanthem. **2. Why the other options are incorrect:** * **Measles (Rubeola):** Characterized by high fever and a maculopapular rash that starts behind the ears and spreads downwards (cephalocaudal). It is preceded by the 3 Cs (Cough, Coryza, Conjunctivitis) and Koplik spots. * **Rubella (German Measles):** Presents with a low-grade fever and a rash similar to measles but milder and of shorter duration (3-day measles), often accompanied by posterior cervical lymphadenopathy. * **Chickenpox (Varicella):** Presents with fever and a classic pleomorphic rash (vesicles in various stages of development) appearing in crops, described as "dewdrops on a rose petal." **High-Yield Clinical Pearls for NEET-PG:** * **Incubation Period:** Rabies has a highly variable incubation period (usually 1–3 months), whereas Measles (10–14 days) and Chickenpox (14–16 days) are more predictable. * **Negri Bodies:** Pathognomonic histological finding in the brain (hippocampus) for Rabies. * **Rule of Thumb:** Most childhood exanthematous illnesses follow the "Fever + Rash" pattern; Rabies follows the "Bite + Hydrophobia" pattern.

Question 156: Multibacillary leprosy is characterized by which of the following?

A. Presence of five lesions
B. Bacteriological index of 2 or greater (Correct Answer)
C. Indeterminate leprosy
D. All of the above

Explanation: **Explanation:** The classification of Leprosy is a high-yield topic for NEET-PG, primarily following the **WHO Operational Classification**, which simplifies treatment protocols into Paucibacillary (PB) and Multibacillary (MB) types. **Why Option B is Correct:** According to the WHO classification, **Multibacillary (MB) leprosy** is defined by a high bacterial load. A **Bacteriological Index (BI) of ≥ 2+** at any site (using slit-skin smears) is a definitive diagnostic criterion for MB leprosy. Even if a patient has few skin lesions, a positive smear automatically classifies them as MB to ensure they receive the more robust 12-month MDT regimen. **Analysis of Incorrect Options:** * **Option A:** Under the WHO criteria, MB leprosy is characterized by having **more than five ( >5 ) lesions**. The presence of exactly five lesions would still be classified as Paucibacillary (PB), which covers 1 to 5 lesions. * **Option C:** Indeterminate leprosy is typically characterized by a single hypopigmented macule with vague margins and is almost always classified and treated as **Paucibacillary (PB)** due to the low bacterial load. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Classification Criteria for MB Leprosy:** 1. > 5 skin lesions. 2. > 1 nerve involvement (some guidelines state ≥ 2 nerves). 3. Positive skin smear (BI ≥ 2+). * **MDT Regimen for MB:** Rifampicin (600mg once monthly), Clofazimine (300mg once monthly + 50mg daily), and Dapsone (100mg daily) for **12 months**. * **Cardinal Signs:** Definite loss of sensation, thickened nerves, and presence of *M. leprae* on skin smear. * **Ridley-Jopling Scale:** MB typically corresponds to Mid-borderline (BB), Borderline Lepromatous (BL), and Lepromatous Leprosy (LL).

Question 157: What is true about the epidemiology of influenza?

A. Asymptomatic cases are seen rarely.
B. The incubation period is 10-12 hours.
C. Pandemics are rare.
D. All ages and sexes are equally affected. (Correct Answer)

Explanation: ### Explanation **Correct Option: D. All ages and sexes are equally affected.** Influenza is characterized by its high infectivity and universal susceptibility. Because the virus undergoes frequent antigenic changes (Drift and Shift), the general population rarely has absolute immunity. Consequently, during an outbreak, **all ages and both sexes are equally susceptible**. While certain groups (elderly, children, or those with comorbidities) are at higher risk for *complications*, the initial attack rate typically shows no predilection for age or gender. **Analysis of Incorrect Options:** * **A. Asymptomatic cases are seen rarely:** This is incorrect. Subclinical or asymptomatic infections are common in influenza and play a significant role in the rapid spread of the virus within a community. * **B. The incubation period is 10-12 hours:** This is incorrect. The incubation period for influenza is typically **1 to 4 days**, with an average of **48 hours**. It is short, but not as brief as 10 hours. * **C. Pandemics are rare:** While pandemics do not occur every year, they are a hallmark of Influenza A. Major pandemics occur at intervals (e.g., 1918, 1957, 1968, and 2009) due to **Antigenic Shift** (major genetic changes). **High-Yield Clinical Pearls for NEET-PG:** * **Antigenic Drift:** Minor mutations in H and N genes; causes **epidemics**; seen in both Influenza A and B. * **Antigenic Shift:** Major genetic change (reassortment); causes **pandemics**; seen **only in Influenza A**. * **Period of Communicability:** Adults are infectious from 1 day before to 5 days after the onset of symptoms. * **Sentinel Surveillance:** This is the preferred method for monitoring influenza trends globally. * **Drug of Choice:** Oseltamivir (Neuraminidase inhibitor) is the standard treatment.

Question 158: In the case of a dog bite, for how long should the biting animal be observed?

A. 5 days
B. 10 days (Correct Answer)
C. 15 days
D. 3 weeks

Explanation: **Explanation:** **1. Why 10 days is the correct answer:** The observation period is based on the pathogenesis of the Rabies virus. In dogs and cats, the virus only appears in the saliva (making the animal infectious) a few days before the onset of clinical symptoms or death. If a dog or cat remains healthy and alive for **10 days** following a bite, it confirms that the animal was not shedding the virus in its saliva at the time of the bite. Therefore, the victim is not at risk of developing Rabies from that specific exposure. **2. Why other options are incorrect:** * **5 days (Option A):** This period is too short. While many rabid animals die within 5 days of showing symptoms, the 10-day window is the globally accepted safety margin to account for the pre-symptomatic shedding phase. * **15 days & 3 weeks (Options C & D):** These periods are unnecessarily long. Scientific evidence shows that no dog or cat has been known to shed the virus for more than 10 days before dying. Extending observation beyond 10 days delays clinical decisions without added benefit. **3. High-Yield Clinical Pearls for NEET-PG:** * **Species:** The 10-day observation rule applies **only to Dogs and Cats**. It does not apply to wild animals or other species. * **Management:** Post-Exposure Prophylaxis (PEP) should be started immediately if the bite is from a suspected rabid animal. It should **not** be delayed while waiting for the observation results. If the animal remains healthy after 10 days, PEP can be discontinued. * **WHO Classification:** Remember the Categories of wounds: * **Category I:** Touching/feeding (No PEP). * **Category II:** Nibbling of uncovered skin, minor scratches (Vaccine required). * **Category III:** Single/multiple transdermal bites, licks on broken skin, or contact with bats (Vaccine + RIG required). * **Incubation Period:** In humans, the most common incubation period is 1–3 months (rarely <7 days or >1 year).

Question 159: All of the following is true regarding blindness except?

A. There are an estimated 45 million people blind worldwide.
B. 20% of blindness cases in India are due to cataract. (Correct Answer)
C. The most common cause of blindness in India is cataract.
D. Visual acuity less than 3/60 is considered blindness.

Explanation: **Explanation:** The correct answer is **B** because the statement is factually incorrect. In India, **cataract** is not a minor contributor but the **leading cause of blindness**, accounting for approximately **66.2%** of cases (according to the National Blindness and Visual Impairment Survey 2015-2019), far exceeding the 20% mentioned in the option. **Analysis of other options:** * **Option A:** According to WHO estimates and the Global Burden of Disease, there are approximately **45 million** people living with blindness globally, making this a true statement. * **Option C:** As per the latest NPCB (National Programme for Control of Blindness) data, **Cataract (66.2%)** remains the most common cause of blindness in India, followed by refractive errors and glaucoma. * **Option D:** Under the NPCBVI (National Programme for Control of Blindness and Visual Impairment) and WHO criteria, blindness is defined as **visual acuity <3/60** (or Snellen equivalent) in the better eye with best possible correction. **High-Yield NEET-PG Pearls:** 1. **Definition Change:** India recently aligned its definition of blindness with the WHO: Visual acuity **<3/60** in the better eye (previously it was <6/60). 2. **Causes of Blindness in India (Ranked):** * Cataract (~66%) * Refractive Error (~18%) * Glaucoma (~5%) * Posterior Segment Disorders/Retinal diseases. 3. **Target:** The WHO "Vision 2020: The Right to Sight" initiative aimed to eliminate avoidable blindness. The current global target is to reduce the prevalence of vision impairment by 25% by 2019 (Integrated people-centered eye care).

Question 160: All of the following statements regarding measles are true except?

A. Rash appears first on the leg (Correct Answer)
B. Koplik spots are seen on the buccal mucosa
C. Long-term complications may be seen in the form of Subacute Sclerosing Panencephalitis (SSPE)
D. Caused by an RNA virus

Explanation: **Explanation:** The correct answer is **A (Rash appears first on the leg)** because it is a false statement. In Measles (Rubeola), the characteristic maculopapular rash follows a **cephalocaudal progression**. It typically appears first behind the ears and along the hairline, spreading downwards to the face, neck, trunk, and finally reaching the extremities (legs) by the third day. **Analysis of other options:** * **Option B:** **Koplik spots** are pathognomonic for measles. They are small, bluish-white grains on an erythematous base found on the buccal mucosa opposite the lower second molars during the pre-eruptive (prodromal) stage. * **Option C:** **SSPE** is a rare, progressive, and fatal demyelinating disease of the central nervous system that occurs 5–10 years after a primary measles infection due to the persistence of a mutant virus. * **Option D:** Measles is caused by an **RNA virus** belonging to the genus *Morbillivirus* of the family *Paramyxoviridae*. **High-Yield Clinical Pearls for NEET-PG:** * **Infectivity:** Highly contagious from 4 days before to 5 days after the appearance of the rash. * **Vitamin A:** Supplementation is recommended for all children with acute measles to reduce mortality and prevent blindness. * **Isolation:** Respiratory isolation is required; the virus is transmitted via droplet nuclei. * **Most common complication:** Otitis media. * **Most common cause of death:** Pneumonia (secondary bacterial infection).

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