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
Causes of bile duct strictures are:a) Bile duct carcinomab) Chronic pancreatitisc) Acute pancreatitisd) Traumae) CBD stone 
Select and explain. 
A. abcd, B. bcde, C. abde, D. ade
C: abde
Answer: C: abde 
Explanation: None