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': 'Which of the following increases appetite ? \nSelect and explain. \nA. Insulin, B. Leptin, C. a-MSH, D. Neuropeptide Y', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Neuropeptide Y", 'role': 'assistant'}]