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 one of the following drug may be used for prevention of relapse of P. vivax infection : \nSelect and explain. \nA. Chloroquine, B. Primaquine, C. Atovaquone, D. Tetracycline', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]