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
Which of the following increases appetite ? 
Select and explain. 
A. Insulin, B. Leptin, C. a-MSH, D. Neuropeptide Y
D: Neuropeptide Y
Answer: D: Neuropeptide Y 
Explanation: Ans. is 'd' i.e., Neuropeptide Y