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: Surgery
[{'content': 'Most common 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: Most common cause of obstructive jaundice is CBD stones.It can also be caused by Carcinoma head of pancreas,Carcinoma of periampullary region,Carcinoma of gallbladder,Biliary stricture,& Viral hepatitis.Obstructive jaundice caused by gallstones is intermittent while in the rest of the cases,jaundice progressively increases over weeks. Reference:SRB's manual of surgery,5th edition,page no:651", 'role': 'assistant'}]