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
Best method to visualize the proximal bile duct is by: 
Select and explain. 
A. Percutaneous transhepatic cholangiogram, B. EUS, C. ERCP, D. Transabdominal USG
A: Percutaneous transhepatic cholangiogram
Answer: A: Percutaneous transhepatic cholangiogram 
Explanation: 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)