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
[{'content': 'Maximum duration of time spent is in NREM stage \nSelect and explain. \nA. I, B. II, C. III, D. IV', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Young adulthood, the distribution of sleep is as follows- NREM 75% stage 1 5% stage 2 45% stage 3 12% stage 4 13% REM 25% Ref- Synopsis of psychiatry, 11e, pg 535.', 'role': 'assistant'}]