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': 'Defect in Orexin production is seen in \nSelect and explain. \nA. Hearing defect, B. Narcolepsy, C. Kluver-Bucy syndrome, D. Voracious appetite', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In\xa0Narcolepsy there is defect in Orexin production', 'role': 'assistant'}]