<prompt> Most common functional neuroendocrine tumor of pancreas?GastrinomaSomatostatinomaInsulinomaVIPoma  <response>: The incidence of Insulinoma is 1-2 whereas the dente of ZES is given as 0.5-1.5. Name Biologically active peptides secreted Incidence new cases 106 populationyear Tumor location Well- established functional pNET syndromes Zollinger- Ellison Syndrome Gastrin 0.5-1.5 Duodenum 70 Pancreas 25 Insulinoma Insulin 1-2 Pancreas 99 VIPoma Verner-Morrison syndrome, pancreatic cholera, WDHA Vasoactive intestinal peptide 0.05-0.2 Pancreas 99, adult other 10,neural, adrenal, periganglionic Glucagonoma Glucagon 0.01-0.1 Pancreas 100 Somatostatinoma Somatostatin Rare Pancreas 55 Duodenumjejunum 44 