This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2017, Subject name: Surgery
[{'content': 'Best method to visualize the proximal bile duct is by: \nSelect and explain. \nA. Percutaneous transhepatic cholangiogram, B. EUS, C. ERCP, D. Transabdominal USG', 'role': 'user'}, {'content': 'Answer: A \nExplanation: IOC for proximal pa of biliary tract = Percutaneous transhepatic cholangiogram (both diagnostic and therapeutic) IOC for distal pa of biliary tract = ERCP (both diagnostic and therapeutic) IOC for most of biliary tract pathology like (CBD stone; choledochal cyst; biliary stricture; cholangiocarcinoma) = MRCP (only diagnostic)', 'role': 'assistant'}]