This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
D cells of pancreas secrete: September 2012 
Select and explain. 
A. Glucagon, B. Insulin, C. Somatostatin, D. Pancreatic polypeptide
C: Somatostatin
Answer: C: Somatostatin 
Explanation: Ans. C i.e. SomatostatinPancreasIt is a dual-function gland, having features of both endocrine and exocrine glands.The pa of the pancreas with endocrine function is made up of approximately a million cell clusters called islets of Langerhans.Four main cell types exist in the islets. They can be classified by their secretion:- Alpha cells secrete glucagon (increase glucose in blood),- Beta cells secrete insulin (decrease glucose in blood),Delta cells secrete somatostatin (regulates/stops alpha and beta cells) and- PP cells, or gamma cells, secrete pancreatic polypeptide