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
[{'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: D \nExplanation: 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.', 'role': 'assistant'}]