This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Endocrinology), Subject name: Medicine
Somatostatin is secreted by : 
Select and explain. 
A. D-cell, B. A-cell, C. B-cell, D. Dl-cell
A: D-cell
Answer: A: D-cell 
Explanation: Ans. is A D-cell (Ref Ganong, 20/e, p. 339). Delta cells secrete - somatostatin* Beta cells secrete - insulin* Alpha cells of pancreas - glucagon*