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
Most common surgical cause of obstructive jaundice? 
Select and explain. 
A. Periampullary carcinoma, B. Carcinoma gall bladder, C. Carcinoma head of pancreas, D. CBD stones
D: CBD stones
Answer: D: CBD stones 
Explanation: Ans. is 'd' i.e., CBD Stones Most common surgical cause of obstructive jaundice is choledocholithiasis