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: Medicine
[{'content': 'Treatment of choice for tropical splenomegaly is \nSelect and explain. \nA. Chloroquine 6 months, B. Mefloquine 3 months, C. Proguanil, D. Pyrimethamine + sulphadoxine X 1 month', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]