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': 'Opisthorchis sinensis can cause: \nSelect and explain. \nA. Cholangiocarcinoma, B. Liver carcinoma, C. Pancreatic carcinoma, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Cholangiocarcinoma', 'role': 'assistant'}]