<prompt> Which is the most common entero-pancreatic tumour in MEN 1?InsulinomaVIPomaNon-functioning pituitary adenomaGastrinoma  <response>: Most common entero-pancreatic tumour in MEN 1 is gastrinoma which leads to recurrent peptic ulcers. The diagnosis is established by demonstration of elevated serum gastrin levels and basal gastric acid secretion. Choice C is non functioning pituitary adenoma and not non functioning entero-pancreatic tumor Multiple Endocrine Neoplasia MEN TYPE CHROMOSOMAL LOCATION TUMORS ESTIMATED PENETRACE MEN 1 11q13 Parathyroid adenoma 90 Enteropancreatic tumor 30-70 Gastrinoma 50 Insulinoma 10-30 Nonfunctioning and PPoma 20-55 Glucagonoma 3 VIPoma 1 Pituitary adenoma 15-50 Prolactinoma 60 Somatotrophinoma 25 Coicotropinoma 5 Nonfunctioning 5 