This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sleep-Wake Disorders, Subject name: Psychiatry
[{'content': 'Narcolepsy is due to abnormality in - \nSelect and explain. \nA. Hypothalamus, B. Neocortex, C. Cerebellum, D. Medullaoblongata', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Hypothalamus o Narcolepsy is unique in that those who suffer from it typically fall almost instantaneously into REM sleep,o It is thought that narcolepsy is caused by a malfunctioning of the hypothalamus in brain.", 'role': 'assistant'}]