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 the pancreas secrete: 
Select and explain. 
A. Insulin, B. Glucagon, C. Intestinal peptide, D. Somatostatin
D: Somatostatin
Answer: D: Somatostatin 
Explanation: D i.e. Somatostatin