The fastest acting schizontocidal drug among the following is :
**Core Concept**
The question tests knowledge of antimalarial drugs, specifically their speed of action against the schizont stage of the parasite. **Schizontocidal** drugs target the schizont stage, preventing the parasite from multiplying.
**Why the Correct Answer is Right**
Although the options are missing, typically, the fastest acting schizontocidal drug is considered to be **Artesunate**, due to its rapid onset of action against **Plasmodium** species. It works by releasing reactive oxygen species that damage the parasite's proteins and membranes.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific drug, we can't comment directly, but if it were a drug like **Chloroquine**, it's less effective against certain strains and not as fast-acting as **Artesunate**.
**Option B:** Similarly, without specifics, if considering **Pyrimethamine**, it's slower and often used in combination.
**Option C:** If **Mefloquine** were an option, it's not the fastest acting.
**Option D:** Assuming another common antimalarial, it might not be as rapid as the correct answer.
**Clinical Pearl / High-Yield Fact**
In treating malaria, especially severe cases, the rapid action of a drug like **Artesunate** can be lifesaving. Remember, the choice of antimalarial depends on the region, resistance patterns, and the specific stage of the parasite.
**Correct Answer:** D. Artesunate.