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
A retained stone impacted in distal common bile duct is seen on T- tube cholangiogram. What is the best management of stone - 
Select and explain. 
A. Dissolution therapy, B. Operative removal, C. Endoscopic sphincterotomy and stone extraction, D. No active treatment is required
C: Endoscopic sphincterotomy and stone extraction
Answer: C: Endoscopic sphincterotomy and stone extraction 
Explanation: None