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
The fastest acting schizontocidal drug among the following is: 
Select and explain. 
A. Aemether, B. Mefloquine, C. Chloroquine, D. Proguanil
A: Aemether
Answer: A: Aemether 
Explanation: Aemisinin derivatives like dihydroaemisinin, aeether and aemether etc. are fastest acting antimalarial drugs.