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: Medicine
Part of brain involved in narcolepsy - 
Select and explain. 
A. Neocortex, B. Hypothalamus, C. Cerebellum, D. Putamen
B: Hypothalamus
Answer: B: Hypothalamus 
Explanation: None