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: Surgery
[{'content': 'In which of the following locations, Carcinoid tumor is most common? \nSelect and explain. \nA. Esophagus, B. Stomach, C. Small bowel, D. Appendix', 'role': 'user'}, {'content': "Answer: C \nExplanation: Gastrointestinal carcinoids are most commonly occur in the small intestine (30%). Ref: CSDT, 11th Edition; Harrison's Internal Medicine, 16th Edition, Page 2223", 'role': 'assistant'}]