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 pancreatic tumor in MEN-I is - 
Select and explain. 
A. Gastrinoma, B. Insulinoma, C. Glucagonoma, D. Somatostatinoma
A: Gastrinoma
Answer: A: Gastrinoma 
Explanation: Neuroendocrine tumour frequency in MEN I 
Gastrinoma > Insulinoma > Glucagonoma > Somatostatinoma