This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sleep Disorders, Subject name: Psychiatry
Which about the following is false about narcolepsy? 
Select and explain. 
A. Sleep sudden, B. Presents in 2nd decade, C. Cataplexy, D. Loss of muscle tone
B: Presents in 2nd decade
Answer: B: Presents in 2nd decade 
Explanation: Ans. B. Present in 2nd decadeNarcolepsy: Excessive daytime sleepiness, Cataplexy, Hypnagogic or hypnopompic hallucinations, sleep paralysis.Can occur at any age, although most commonly in adolescence or early adulthood, usually before 30 years