This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Commonest site of peptic ulcer is - \nSelect and explain. \nA. Ist pa of duodenum, B. IInd pa of duodenum, C. Distal 1/3 of stomach, D. Pylorus of the stomach', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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 Barrett's 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", 'role': 'assistant'}]