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
[{'content': 'Insulin secretion is decreased by ? \nSelect and explain. \nA. Glucogen, B. Gastrin, C. Secretin, D. Somatostatin', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Somatostatin", 'role': 'assistant'}]