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: Microbiology
[{'content': 'The largest trematode infecting man is - \nSelect and explain. \nA. F.hepatica, B. F. buski, C. E. Granulosus, D. Clonorchis sinensis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]