This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
Drug useful in chloroquine resistant malaria is 
Select and explain. 
A. Mefloquine, B. Proguanil, C. Pyrimethamine, D. Primaquine
A: Mefloquine
Answer: A: Mefloquine 
Explanation: Mefloquine is effective against chloroquine resistant Plasmodium falciparum.