This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Safest antimalarial drug during pregnancy is: \nSelect and explain. \nA. Mefloquine, B. Pyrimethamine, C. Proguanil, D. Quinine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Proguanil', 'role': 'assistant'}]