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
[{'content': 'Drug useful in chloroquine resistant malaria is \nSelect and explain. \nA. Mefloquine, B. Proguanil, C. Pyrimethamine, D. Primaquine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mefloquine is effective against chloroquine resistant Plasmodium falciparum.', 'role': 'assistant'}]