A young woman employed as a dental laboratory technician complains of conjunctivitis, skin irritation, and hair loss. On examination, she has perforation of the nasal septum and a 'milk and roses' complexion. These signs and symptoms are most likely to be due to

Correct Answer: C

Rationale: Chronic mercury poisoning causes symptoms like conjunctivitis, hair loss, nasal septum perforation, and a 'milk and roses' complexion due to vasodilation and pallor.

Correct Answer: D

Rationale: Pneumococcal vaccine, a polysaccharide vaccine, is used for active immunization in patients with chronic cardiorespiratory conditions.

Correct Answer: A

Rationale: Loop diuretics like furosemide decrease blood volume by increasing urine output, a key therapeutic effect in conditions like heart failure.

Correct Answer: B

Rationale: Mefloquine is recommended for chemoprophylaxis in chloroquine-resistant P. falciparum areas due to its efficacy and once-weekly dosing.

Correct Answer: B

Rationale: Furosemide blocks the Na+/K+/2Cl cotransporter in the thick ascending limb of the loop of Henle, increasing urine output.