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': 'Metrifonate is effective against: \nSelect and explain. \nA. Amoebiasis, B. Leishmaniosis, C. Schistosomiasis, D. Giardiasis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Schistosomiasis', 'role': 'assistant'}]