The largest organ in the body is

Correct Answer: B

Rationale: The skin, covering the body, is the largest organ by surface area and weight (about 15% of body mass). 'Skin,' is correct, per anatomy (e.g., Tortora). 'Liver,' is largest internal. 'Heart,' and 'Lungs,' are smaller. Skin's expanse makes B the precise answer.

Correct Answer: D

Rationale: Zoonotic diseases transfer from animals to humans. 'Influenza,' is correct as the exception, primarily human-to-human, though some strains (e.g., avian) are zoonotic, per epidemiology (e.g., Morens). 'Rabies,' 'Anthrax,' and 'Tuberculosis,' are zoonotic. Influenza's typical transmission makes D the accurate answer.

Correct Answer: D

Rationale: Congenital anomalies are birth defects. 'Pneumonia,' is correct as the exception, an acquired infection, per pediatrics (e.g., Nelson). 'Cleft palate,' 'Spina bifida,' and 'Club foot,' are congenital. Pneumonia's post-birth onset makes D the accurate answer.

Correct Answer: C

Rationale: Fungal diseases are caused by fungi. 'Malaria,' is correct as the exception, protozoan (Plasmodium), per mycology (e.g., Alexopoulos). 'Ringworm,' 'Candidiasis,' and 'Athlete's foot,' are fungal. Malaria's parasitic nature makes C the accurate answer.

Correct Answer: D

Rationale: Immune system diseases involve immune dysfunction. 'Cancer,' is correct as the exception, primarily oncological, per immunology (e.g., Janeway). 'Lupus,' 'Rheumatoid arthritis,' and 'HIV,' affect immunity. Cancer's cellular origin makes D the precise answer.