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
Defect in Orexin production is seen in 
Select and explain. 
A. Hearing defect, B. Narcolepsy, C. Kluver-Bucy syndrome, D. Voracious appetite
B: Narcolepsy
Answer: B: Narcolepsy 
Explanation: In Narcolepsy there is defect in Orexin production