This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bile duct, Subject name: Surgery
Most common cause of biliary stricture is:- 
Select and explain. 
A. CBD stone, B. Trauma, C. Asiatic cholangitis, D. Congenital
B: Trauma
Answer: B: Trauma 
Explanation: MC cause of benign biliary stricture is laparoscopic cholecystectomy (operative trauma).