This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Surgery
Sphincterotomy of sphincter of Oddi is performed at 
Select and explain. 
A. 3 O'clock position, B. 6 O'clock position, C. 9 O'clock position, D. 11 O'clock position
D: 11 O'clock position
Answer: D: 11 O'clock position 
Explanation: This cut is made superiorly (at the 11 o'clock position) for 4 to 5 mm The sphincter is incised at the 11-O'clock position to avoid injury to the pancreatic duct