D cells of Islet of Langerhans of pancreas secrete?: (A) Insulin, (B) Glucagon, (C) Gastrin, (D) Somatostatin
Answer is D. Ans. D SomatostatinRef: Ganong, 25th ed. pg. 154Somatostatin is found in the D cells of pancreatic islets. It inhibits the secretion of insulin, glucagon, and pancreatic polypeptide and may act locally within the pancreatic islets in a paracrine fashion.