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: Psychiatry
[{'content': 'NREM Sleep true is - \nSelect and explain. \nA. Teeth grinding, B. Narcolepsy, C. Night mares, D. Sleep paralysis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bruxism (teeth grinding) is seen during NREM sleep. All other options are disorders of REM sleep.', 'role': 'assistant'}]