This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sleep disorders and eating disorders, Subject name: Psychiatry
[{'content': 'Narcolepsy is due to abnormality in \nSelect and explain. \nA. Hypothalamus, B. Neocoex, C. Cerebellum, D. Medulla oblongata', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Narcolepsy is the prototypical example of sleepiness produced by a basic CNS dysfunction of sleep mechanisms. The etiology stems from a genetically triggered Hypocretin dysfunction and deficit. It is apparent that the hypocretin system plays a critical role in narcolepsy. The Hypocretin producing cell bodies are specific to Hypothalamus and have widespread anatomical projections. Ref: Synopsis of Psychiatry, 11e, pg 548. Ebrahim IO, Howard RS et al. The Hypocretin/ Orexin system. J R Soc Med, 2002 May, 95(5), 227-30.', 'role': 'assistant'}]