This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach & Duodenum, Subject name: Surgery
Commonest site of peptic ulcer is: 
Select and explain. 
A. 1st part of duodenum, B. 2nd part of duodenum, C. Distal 1/3rd of stomach, D. Pylorus of the stomach
A: 1st part of duodenum
Answer: A: 1st part of duodenum 
Explanation: Ans. (a) 1st part of duodenumRef: Sabiston 19th Edition, Page 1199* Most common location 1st part of duodenum* Most common location in stomach is incisura angularis