This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Surgery
Most common neuroendocrine tumour of pancreas is 
Select and explain. 
A. Insulinoma, B. Gastrinoma, C. Non-functional tumours, D. VIPoma
A: Insulinoma
Answer: A: Insulinoma 
Explanation: TumourIncidence%Insulinoma70-80Gastrinoma20-25Non-functional tumours30-50VIPoma4Glucagonoma4Somatostatinoma<5Carcinoid<1ACTHoma<1GRFoma<1Ref: Bailey and Love 27e pg: 846