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
In which of the following locations, Carcinoid tumor is most common? 
Select and explain. 
A. Esophagus, B. Stomach, C. Small bowel, D. Appendix
C: Small bowel
Answer: C: Small bowel 
Explanation: Gastrointestinal carcinoids are most commonly occur in the small intestine (30%). Ref: CSDT, 11th Edition; Harrison's Internal Medicine, 16th Edition, Page 2223