<prompt> Commonest endocrine tumor of pancreasA cellsB cellsDelta cellsVIPoma  <response>: Insulinomas- arising from B cells of pancreas- are the commonest endocrine pancreatic tumour60. Gastrinomas - arising from non-beta cells G cells of the pancreas- are the 2nd most common endocrine pancreatic tumour. Then comes Glucagonomas arising from A cells and VIPomas arising from D2 cells of pancreas. Reference : page 709-10 SRBs manual of surgery 5th edition 