This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
[{'content': 'Sleep center is located in \nSelect and explain. \nA. Basal ganglia, B. Medulla, C. Hypothalamus, D. Cerebellum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Hypothalamus(Ref: Ganong, 25th ed/p.273)Preoptic nucleus of hypothalamus particularly ventrolateral preoptic nucleus promotes sleep', 'role': 'assistant'}]