This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Fish is one of host for all of the following except ( NOT RELATED) \nSelect and explain. \nA. Paragonimus westermani, B. Clonorchis sinensis, C. Opisthorchis viverrini, D. Diphyllobothrium latum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]