This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrine System, Subject name: Physiology
[{'content': 'Insulin release is inhibited by: \nSelect and explain. \nA. Somatostatin, B. Glucagon, C. Acetylcholine, D. Amino acids', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Somatostatin, secreted by d cells of pancreas, inhibits the other two secretions of the endocrine pancreas - insulin & glucagon. The primary stimulators of the somatostatin are glucose, amino acids, and fatty acids. Parasympathetic nervous system (vagus/Ach) is a stimulator of insulin secretion. Insulin secretion is inhibited by epinephrine acting alpha-2 adrenergic receptors. Amino acids, FFAs, and glucose are the stimulators of insulin secretion.', 'role': 'assistant'}]