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': 'Tissue schizontocide which prevents relapse of vivax malaria - \nSelect and explain. \nA. Quinine, B. Primaquine, C. Pyrimethamine, D. Chloroquine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Primaquine o Primaquine is the only tissue schizonticide to prevent relapse.", 'role': 'assistant'}]