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: Surgery
[{'content': 'An increased incidence of cholangiocarcinoma is seen in all of the following except \nSelect and explain. \nA. Hydatid cyst of liver, B. Polycystic disease of liver, C. Sclerosing cholangitis, D. Liver flukes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]