<prompt> Commonest site of peptic ulcer is1st pa of duodenum2nd pa of duodenumDistal 13rd of stomachPylorus of the stomach  <response>: 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 Meckels diveiculum, which contains ectopic gastric epithelium.Bailey and love pg: 1116 