This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
Most common site of adenocarcinoma among the following 
Select and explain. 
A. Duodenum, B. Jejunum, C. Ileum, D. Appendix
A: Duodenum
Answer: A: Duodenum 
Explanation: Ans. (a) DuodenumRef: Sabiston 19th edition, Page 1263* Most common type of cancer in small intestine is adenocarcinoma* Most common site is duodenum > proximal jejunum