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': 'Which of the following is false about cholangiocarcinoma \nSelect and explain. \nA. Investigation of choices MRCP, B. Staging is done by PET CT, C. Diagnosis is done by CECT, D. Choledochal cyst is a risk factor.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Diagnosis is made by MRCP', 'role': 'assistant'}]