This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, 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
D: Appendix
Answer: D: Appendix 
Explanation: carcinoid tumour commonly occurs in appendix(45%),ileum(25%),rectum(15%).other sites are(15%)other pas of GIT ,bronchus, and testis SRB,5th,877.