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': 'Most common surgical cause of obstructive jaundice? \nSelect and explain. \nA. Periampullary carcinoma, B. Carcinoma gall bladder, C. Carcinoma head of pancreas, D. CBD stones', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., CBD Stones Most common surgical cause of obstructive jaundice is choledocholithiasis", 'role': 'assistant'}]