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: Medicine
Most common tumor of pancreas is - 
Select and explain. 
A. Insulinoma, B. Gastrinoma, C. APUD's omas, D. VLPoma
A: Insulinoma
Answer: A: Insulinoma 
Explanation: None