Which of the following antimalarial drugs is more active against pre-and exoerythrocytic stages of the malarial parasite than against the erythrocytic stage?

Correct Answer: B

Rationale: Primaquine targets pre- and exoerythrocytic stages (hypnozoites), more than erythrocytic stages.

Correct Answer: C

Rationale: Tinidazole has a longer half-life than metronidazole, allowing less frequent dosing.

Correct Answer: A

Rationale: Quiniodochlor (iodoquinol) can cause optic neuropathy, contraindicating its use in children.

Correct Answer: C

Rationale: Sodium stibogluconate is the drug of choice for visceral leishmaniasis (Kala Azar).

Correct Answer: B

Rationale: Albendazole is less effective than mebendazole for trichuriasis (whipworm), though it’s preferred for hydatid disease.