<prompt> The triad of diabetes, gallstones and steatorrhea is associated with -GastrinomaSomatostatinomaVlPomaGlucagonoma  <response>: The somatostatinoma syndrome is due to an neuroendocrine tumour NET that secretes excessive amounts of somatostatin, which causes a distinct syndrome characterized by diabetes mellitus, gallbladder disease, diarrhea, and steatorrhea. The mean age is 51 years. Somatostatinomas occur primarily in the pancreas and small intestine. Reference : page 570 Harrisons Principles of Internal Medicine 19th edition 