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: Anatomy
[{'content': 'Brunners glands are seen in ? \nSelect and explain. \nA. Jejunum, B. Upper duodenum, C. Lower duodenum, D. Appendix', 'role': 'user'}, {'content': "Answer: B \nExplanation: Upper duodenumThe presence of mucous duodenal (Brunner's) glands in the submucosa is indicative of upper duodenum. These submucosal glands are absent in the jejunum, ileum and the entire large intestine.", 'role': 'assistant'}]