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
Following hormones are produced by endocrinal part of pancreas, except: 
Select and explain. 
A. Insulin, B. Somatostatin, C. Glucagon, D. Bombesin
D: Bombesin
Answer: D: Bombesin 
Explanation: Bombesin is a 14 amino acid peptide isolated from amphibian skin, which was found to have stimulatory effects upon gastric and pancreatic secretions, release of gastrointestinal hormones,  gallbladder contraction and bronchoconstriction.