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
Which is the MOST common neoplasm of appendix? 
Select and explain. 
A. Lymphoma, B. Adenocarcinoma, C. Leiomyosarcoma, D. Argentaffinoma
B: Adenocarcinoma
Answer: B: Adenocarcinoma 
Explanation: Sabiston writes: Although it was previously believed that carcinoid tumors were the most common appendiceal neoplasm, analysis of the surveillance, Epidemiology, and End results (SEER) database indicate that mucinous tumors are most common in appendix. Ref: Sabiston 18/e, Page 1345