This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Malaria Drugs, Subject name: Pharmacology
Which of the following antimalarial drug is a slow acting erythrocytic schizonticidal drug for malaria? 
Select and explain. 
A. Aemether, B. Mefloquine, C. Pyrimethamine, D. Quinine
C: Pyrimethamine
Answer: C: Pyrimethamine 
Explanation: Erythrocytic schizonticides may be fast acting or slow acting: Fast acting M - Mefloquine A - Atovaquone C - Chloroquine (and amodiaquine and piperaquine) H - Halofantrine (and lumefant rine) A - Aemisinins R - Res-Q (Quinine) - Slow acting: Proguanil Pyrimethamine Sulfonamides T Tetracyclines Clindamycin