Forensic Medicine
5 questionsWhich of the following statements about Platauf's hemorrhages is correct?
What is the most common type of drowning in India?
What is the diagnostic sign of antemortem drowning?
Which of the following tests is NOT used in the medico-legal investigation of suspected infanticide?
What is the term for sexual intercourse between closely related individuals?
NEET-PG 2013 - Forensic Medicine NEET-PG Practice Questions and MCQs
Question 481: Which of the following statements about Platauf's hemorrhages is correct?
- A. Subpleural hemorrhage (Correct Answer)
- B. All are true
- C. Mostly seen in middle lobe
- D. Sign of drowning
Explanation: ***Subpleural hemorrhage*** - **Platauf's hemorrhages** are **defined as subpleural hemorrhages** found on the surface of the lungs, particularly in cases of **asphyxial death** related to drowning. - This is the **most accurate and specific statement** as it describes the **pathological nature** of Platauf's hemorrhages. - These hemorrhages result from the rupture of small capillaries due to sudden increase in intrathoracic pressure and aspiration of water during drowning. - They appear as **small petechial hemorrhages** on the **anterior, lateral, and inferior surfaces** of the lungs. *Mostly seen in middle lobe* - This is **incorrect**. Platauf's hemorrhages can occur in **any lobe** of the lungs, not specifically the middle lobe. - They are more commonly described as being present on the **anterior and lateral margins** and **inferior surfaces** of the lungs, regardless of lobe. *All are true* - This statement is **incorrect** because the statement about the middle lobe is false, making "All are true" false. *Sign of drowning* - While this statement has merit, it is **less specific** than "subpleural hemorrhage." - Platauf's hemorrhages are indeed **strongly associated with drowning** and are considered one of the **internal findings in drowning deaths**. - However, they are **not absolutely pathognomonic** - they can occasionally be seen in other forms of acute asphyxia or conditions involving severe acute pulmonary congestion. - The **defining characteristic** is that they are **subpleural hemorrhages**, which is a more precise pathological description than calling them simply a "sign of drowning." - Therefore, when asked "which statement is correct," the **most accurate and specific answer** is "Subpleural hemorrhage."
Question 482: What is the most common type of drowning in India?
- A. Suicidal
- B. Homicidal
- C. Accidental (Correct Answer)
- D. Infanticide
Explanation: ***Accidental*** - Accidental drowning is the most common type because it can occur in various situations, such as during **bathing**, **swimming**, **boating**, or falling into bodies of water due to **unforeseen circumstances** or **lack of supervision**. - This category encompasses a wide range of scenarios, including **children falling into wells** or other water sources, and adults being swept away by **flooding rivers** or **tsunamis**. *Suicidal* - While suicidal drownings do occur, they are **statistically less common** than accidental drownings in the general population. - Suicide by drowning generally involves an **intentional act** to end one's life, which is less frequent than unintentional water-related deaths. *Homicidal* - Homicidal drowning, where an individual is drowned by another person, is **rare** compared to accidental deaths. - This type of drowning often involves **evidence of struggle** or other injuries, making it a distinct but uncommon cause of death. *Infanticide* - Infanticide by drowning refers to the **intentional killing of an infant** through submersion in water. - While a tragic act, incidents of infanticide by drowning are **very low in number** compared to overall accidental drownings involving all age groups.
Question 483: What is the diagnostic sign of antemortem drowning?
- A. Emphysema aquosum
- B. Water in esophagus
- C. Weeds and grass in clenched hands
- D. Paltauf's hemorrhage (Correct Answer)
Explanation: ***Paltauf's hemorrhage*** - These are **subpleural ecchymoses** (petechial hemorrhages) found on the surface of the lungs that represent the **definitive diagnostic sign** of antemortem drowning. - They result from rapid changes in **pulmonary pressure** and vascular permeability due to active breathing efforts and water aspiration during the drowning process. *Emphysema aquosum* - This refers to **overdistention of lungs** with frothy fluid in airways, commonly seen in drowning cases. - It represents a **morphological change** rather than a specific diagnostic sign and can occur in various types of asphyxial deaths. *Water in esophagus* - Water presence in the esophagus occurs due to **swallowing during immersion** or passive post-mortem water entry. - This finding **cannot differentiate** between antemortem and post-mortem drowning as water can enter passively after death. *Weeds and grass in clenched hands* - While **cadaveric spasm** with vegetation indicates the person was alive during immersion and actively struggling, it is **not the diagnostic sign** of antemortem drowning. - This finding confirms **vital reaction** at the time of immersion but does not specifically diagnose the drowning mechanism itself.
Question 484: Which of the following tests is NOT used in the medico-legal investigation of suspected infanticide?
- A. Ploucquet test
- B. Fodere's test
- C. Widal test (Correct Answer)
- D. Hydrostatic test
Explanation: ***Widal test*** - The **Widal test** is a serological test used to diagnose **typhoid fever** by detecting antibodies against *Salmonella typhi* antigens, not for infanticide. - It assesses the presence of **O and H agglutinins** in the patient's serum after exposure to the bacteria. *Ploucquet test* - The **Ploucquet test** assesses the **weight of the lungs** relative to the total body weight to determine if the infant has breathed. - In a stillborn infant, the ratio of lung weight to body weight is typically lower than in a liveborn infant who has breathed. *Fodere's test* - **Fodere's test**, also known as the **gastrointestinal air test**, examines the presence of air in the **gastrointestinal tract** of an infant. - The presence of air indicates that the infant has **breathed and swallowed**, suggesting live birth. *Hydrostatic test* - The **hydrostatic test** (or lung float test) involves placing the infant's lungs in water to determine if they **float or sink**. - **Floating lungs** indicate the presence of air, suggesting the infant took a breath, while **sinking lungs** suggest no respiration.
Question 485: What is the term for sexual intercourse between closely related individuals?
- A. Incest (Correct Answer)
- B. Extramarital affair
- C. Bestiality
- D. Tribadism
Explanation: ***Incest*** - This term refers to **sexual activity** between individuals who are considered **too closely related** to marry or have sexual relations within a particular society's laws or customs. - The definition of closeness can vary culturally and legally, but it generally includes immediate family members like parents, children, and siblings. - Under Indian law (IPC Section 376), incestuous relationships are prohibited and can constitute sexual offenses. *Extramarital affair* - This describes sexual relations between a **married person** and someone who is **not their spouse**. - It does not necessarily involve closely related individuals; the key aspect is the breach of marital fidelity. - This is a social/moral term rather than specifically a forensic classification. *Bestiality* - This refers to sexual activity between a **human and an animal**, also known as **zoophilia**. - This is distinct from incest, which specifically concerns human-to-human sexual relations within a family. - Under IPC Section 377, this was considered an unnatural offense. *Tribadism* - This describes various forms of **sexual intimacy between women**, particularly non-penetrative activity. - This term does not involve familial relationships or biological closeness as defined by incest. - It is a descriptive term for a type of sexual behavior, not a classification of prohibited relationships.
Microbiology
4 questionsWhich of the following statements about interleukin-1 is false?
Cytolytic activity of membrane attack complex is modulated by ?
Which gene of Hepatitis B virus (HBV) is most commonly associated with mutations causing antiviral drug resistance?
Rosette formation with sheep RBCs (SRBCs) indicates functioning of -
NEET-PG 2013 - Microbiology NEET-PG Practice Questions and MCQs
Question 481: Which of the following statements about interleukin-1 is false?
- A. IL-1 is an endogenous pyrogen.
- B. The primary source of IL-1 is the monocyte-macrophage system.
- C. IL-1 inhibits IL-2 production by T-cells. (Correct Answer)
- D. IL-1 promotes acute phase protein synthesis in the liver.
Explanation: ***IL-1 inhibits IL-2 production by T-cells*** - This statement is false because **IL-1** actually **enhances the production of IL-2** by T-cells, which is crucial for T-cell proliferation and immune response. - **IL-1 acts synergistically with IL-6 and TNF-α** to promote inflammation and immune cell activation, where IL-2 plays a key role. *The primary source of IL-1 is the monocyte-macrophage system* - This statement is true; **monocytes and macrophages** are the main producers of **IL-1α and IL-1β** upon activation by various stimuli. - Other cells, such as neutrophils, dendritic cells, and endothelial cells, can also produce IL-1, but monocytes and macrophages are the predominant source. *IL-1 is an endogenous pyrogen* - This statement is true; **IL-1** is a potent **endogenous pyrogen** that acts on the hypothalamus to induce fever, a hallmark of the acute phase response. - It triggers prostaglandin synthesis in the hypothalamus, leading to an elevation in the body's thermoregulatory set point. *IL-1 promotes acute phase protein synthesis in the liver* - This statement is true; **IL-1** is a key mediator that stimulates **hepatocytes** to produce **acute phase proteins**, such as C-reactive protein and serum amyloid A. - This hepatic response is part of the innate immune system's effort to control infection and inflammation.
Question 482: Cytolytic activity of membrane attack complex is modulated by ?
- A. Factor I
- B. Factor B
- C. Factor S (vitronectin) (Correct Answer)
- D. Factor H
Explanation: ***Correct Option: Factor S (vitronectin)*** - Vitronectin (S-protein) is a **plasma protein** that directly modulates the **cytolytic activity of the membrane attack complex (MAC)**. - It binds to the **C5b-7 complex** in the fluid phase, preventing its insertion into target cell membranes and thereby blocking the formation of the complete, functional MAC. - By inhibiting membrane insertion of C5b-7, vitronectin prevents the subsequent binding of **C8 and C9**, which are essential for the cytolytic pore formation. - This is a **direct modulation** of MAC's cytolytic activity at the MAC assembly stage. *Incorrect Option: Factor H* - Factor H is a regulatory protein that controls the **alternative pathway** of complement activation by promoting degradation of **C3b**. - By degrading C3b, Factor H prevents formation of **C5 convertase**, thereby reducing downstream MAC formation. - However, Factor H acts **early in the complement cascade** and does not directly modulate the cytolytic activity of already-formed MAC components. - Its effect is on **preventing MAC formation**, not on modulating MAC's cytolytic function itself. *Incorrect Option: Factor I* - Factor I is a **serine protease** that cleaves and inactivates C3b and C4b, requiring cofactors like Factor H or C4bp. - Like Factor H, it regulates complement activation **upstream** of MAC formation. - It does not directly interact with or modulate the cytolytic activity of the MAC. *Incorrect Option: Factor B* - Factor B is a component of the **alternative pathway C3 convertase** (C3bBb). - It **promotes complement activation** rather than modulating MAC's cytolytic activity. - Factor B functions early in the cascade and has no direct role in regulating MAC function.
Question 483: Which gene of Hepatitis B virus (HBV) is most commonly associated with mutations causing antiviral drug resistance?
- A. X gene
- B. S gene
- C. C gene
- D. P gene (Correct Answer)
Explanation: ***P gene*** - The **P gene** (polymerase gene) of HBV encodes the viral reverse transcriptase which is essential for viral replication. - Mutations in the P gene can lead to **antiviral drug resistance**, particularly to nucleos(t)ide analogues. *X gene* - The **X gene** encodes the X protein (HBx), a **transcriptional transactivator** involved in viral replication and pathogenesis. - While important for viral function, it is not the primary target for antiviral therapy, and mutations are less frequently associated with drug resistance. *S gene* - The **S gene** encodes the **surface antigens (HBsAg)**, which are crucial for viral entry and immune evasion. - Mutations in the S gene can lead to **vaccine escape mutants** or alter HBsAg detection, but not directly responsible for antiviral resistance. *C gene* - The **C gene** encodes the **core protein (HBcAg)** and the precore protein (HBeAg). - These proteins are involved in **viral particle assembly** and immune modulation, but mutations in this gene are not typically associated with resistance to antiviral drugs.
Question 484: Rosette formation with sheep RBCs (SRBCs) indicates functioning of -
- A. T-cells (Correct Answer)
- B. B-cells
- C. Neutrophils
- D. Monocytes
Explanation: ***T-cells*** - **T-cells** possess specific receptors, like **CD2** on their surface, that can bind to ligands on sheep red blood cells (SRBCs). - This binding leads to the formation of characteristic **rosettes**, where SRBCs cluster around the T-lymphocytes, indicating functional T-cells. *B-cells* - **B-cells** primarily function in **humoral immunity** by producing antibodies and do not typically form rosettes with sheep RBCs. - While B-cells have surface receptors, they are not CD2 and thus do not facilitate this specific type of rosette formation. *Neutrophils* - **Neutrophils** are **phagocytic cells** involved in innate immunity, primarily combating bacterial and fungal infections. - They lack the specific surface receptors (like CD2) required to form rosettes with sheep RBCs. *Monocytes* - **Monocytes** are precursors to macrophages and dendritic cells, involved in phagocytosis and antigen presentation. - They do not possess the necessary surface markers to form rosettes with sheep RBCs.
Pathology
1 questionsThe most common subtype of Non-Hodgkin's lymphoma in India is:
NEET-PG 2013 - Pathology NEET-PG Practice Questions and MCQs
Question 481: The most common subtype of Non-Hodgkin's lymphoma in India is:
- A. Diffuse small cell lymphocytic lymphoma
- B. Diffuse large B cell lymphoma (Correct Answer)
- C. Follicular lymphoma
- D. Burkitt's lymphoma
Explanation: ***Diffuse large B cell lymphoma*** - It is the most common subtype of **Non-Hodgkin's lymphoma** observed in India, reflecting a higher prevalence in the population. - Characterized by **aggressive clinical behavior** [1] and typically presents as a rapidly enlarging mass, often involving lymph nodes or extranodal sites. *Burkitt's lymphoma* - This subtype is known for its **high proliferation rate** and is more common in specific demographics, such as children and immunocompromised individuals. - It typically presents with **jaw lesions** or abdominal masses, which is not typical in the broader Indian population. *Diffuse small cell lymphocytic lymphoma* - More accurately classified as **chronic lymphocytic leukemia** (CLL), it is not the most common subtype of Non-Hodgkin's lymphoma. - Characterized by a **milder clinical course** and presents with lymphocytosis in peripheral blood, lacking aggressive features. *Follicular lymphoma* - This is usually a **low-grade lymphoma** associated with **indolent behavior** and may not be the most commonly diagnosed subtype in India. - It typically involves multiple lymph nodes and is characterized by **nodular patterns on histology**, making it less prevalent than diffuse large B cell lymphoma. Follicular lymphoma is rare in Asian populations [2]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 563-564. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 602-604.