This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
[{'content': 'ERCP is indicated for the following except \nSelect and explain. \nA. Distal CBD tumor, B. Hepatic poa tumor, C. Proximal cholangiocarcinoma, D. Gallstone pancreatitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .', 'role': 'assistant'}]