This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
Commonest site of peptic ulcer is 
Select and explain. 
A. 1st pa of duodenum, B. 2nd pa of duodenum, C. Distal 1/3rd of stomach, D. Pylorus of the stomach
A: 1st pa of duodenum
Answer: A: 1st pa of duodenum 
Explanation: Common sites for peptic ulcers are the first pa of the duodenum and the lesser curve of the stomach, but they also occur on the stoma following gastric surgery, the oesophagus and even in a Meckel's diveiculum, which contains ectopic gastric epithelium.Bailey and love pg: 1116