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: Psychiatry
Narcolepsy is due to abnormality in ? 
Select and explain. 
A. Hypothalamus, B. Neocoex, C. Cerebellum, D. Medulla oblongata
A: Hypothalamus
Answer: A: Hypothalamus 
Explanation: Ans. A. HypothalamusNarcolepsy is unique in that those who suffer from it tyPicaly fall almost instantaneously into REM sleep.It is thought that narcolepsy is caused by a malfunctioning of the hypothalamus in brain.