This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
Most common tumor of appendix is 
Select and explain. 
A. Carcinoid tumor, B. Pseudomyxoma peritonitis, C. Adenocarcinoma, D. Mucocele
A: Carcinoid tumor
Answer: A: Carcinoid tumor 
Explanation: Refer Robbins page no 9/e 816 Cancer of the appendix may causeappendicitis or rupture of appendicitis. Mostly this is the first symptom of appendix cancer. The majority of appendiceal tumors arecarcinoids, while the remaining 10% to 20% are mucinous cyst-adenocarcinoma,adenocarcinoma, lymphosarcoma,paraganglioma, and granular-cell tumors.