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
Brunner's gland are found in mucosa of 
Select and explain. 
A. Stomach, B. Colon, C. Duodenum, D. Esophagus
C: Duodenum
Answer: C: Duodenum 
Explanation: C. i.e. Duodenum