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
Brunners glands are seen in - 
Select and explain. 
A. Jejunum, B. Upper duodenum, C. Lower duodenum, D. Appendix
B: Upper duodenum
Answer: B: Upper duodenum 
Explanation: B i.e., Upper duodenum The presence of mucous duodenal (Brunner's) glands in the submucosa is indicative of upper duodenumQ. These submucosal glands are absent in the jejunum, ileum & the entire large intestine.The histology of lower duodenum, jejunum, and ileum remains similar to that of the upper duodenum. The only differences are.- duodenal glands of Brunner are limited to upper pa of duodenumQ- large aggregates of lymphatic nodules (Peyer's patches) are observed in lower regions of ileumQ