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
[{'content': 'Most common site of adenocarcinoma among the following \nSelect and explain. \nA. Duodenum, B. Jejunum, C. Ileum, D. Appendix', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]