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
Not true about Narcolepsy is 
Select and explain. 
A. Cataplexy, B. Sleep architecture normal, C. Loss of muscle tone, D. Hallucination
B: Sleep architecture normal
Answer: B: Sleep architecture normal 
Explanation: Narcolepsy is neither a typs of epilepsy nor a psychogenic disturbance. It is an abnormality of the sleep mechanisms specifically, REM inhibiting mechanisms. Ref: Synopsis of Psychiatry, 11e, pg 547.