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': 'Which of the following antimalarial drugs is a slow acting schizonticide? \nSelect and explain. \nA. Artemether, B. Mefloquine, C. Pyrimethamine, D. Quinine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]