This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
[{'content': 'The principal polypeptide that increases food intake are all except \nSelect and explain. \nA. Neuropeptide Y, B. Leptin, C. Orexin A, D. Ghrelin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: An orexigenic, or appetite stimulant, is a drug, hormone, or compound that increases appetite and may induce hyperphagia. This can be a naturally occurring neuropeptide hormone such as ghrelin, orexin or neuropeptide Y, or a medication which increases hunger and therefore enhances food consumption Ref: guyton and hall textbook of medical physiology 12 edition page number:811,812,813', 'role': 'assistant'}]