<prompt> Commonest site of peptic ulcer is -Ist pa of duodenumIInd pa of duodenumDistal 13 of stomachPylorus of the stomach  <response>: Ans. is a i.e., 1st pa of Duodenum Duodenum, 1st poion Stomach, usually antrum At the gastro - esophageal junction, in the setting of gastroesophageal reflux or Barretts esophagus Within the margins of a gastrojejunostomy In the duodenum, stomach or jejunum of patients with Zollinger-Ellison Syndrome Within or adjacent to Meckels diveiculum that contains ectopic gastric mucosa 