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: Pathology
[{'content': 'Peptic ulceration occurs at all the following sites except - \nSelect and explain. \nA. Lesser curvature, B. First part of duodenum, C. Lower end of esophagus, D. Stoma of gastric portion of gastrojejunostomy', 'role': 'user'}, {'content': "Answer: D \nExplanation: Peptic ulcer\n\nUlcers are defined histologically as a breach in the mucosa of the alimentary tract that extends through the muscular mucosa into the submucosa or deep.\nPeptic ulcers are chronic, most often solitary lesions that occur in any portion of the gastrointestinal tract exposed to the aggressive action of acid/peptic juice.\n\nPeptic ulcers located in the following sites, in order of decreasing frequency :\n\nDuodenum, 1st portion\nStomach, usually antrum\nAt the gastro - esophageal junction in the setting of gastroesophageal reflux or Barrett's esophagus.\nWithin the margins of a gastrojejunostomy.\nIn the duodenum, stomach or jejunum of patients with Zollinger -Ellison Syndrome.\nWithin or adjacent to Meckel's diverticulum that contains ectopic gastric mucosa.", 'role': 'assistant'}]