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': 'Bruxism is seen in ? \nSelect and explain. \nA. NREM stage 1,2, B. NREM stage 3,4, C. REM, D. Any of the above', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., NREM stage 3, 4 Slow wave sleep (stage 3 & 4 of NREM sleep) disorders :- Sleep walking (somnambulism), night terror (sleep terror or pavornocturnus), Nocturnal enuresis, Bruxism (teeth grinding), and sleep talking (somniloquy). REM sleep events/disorder :- Nightmares, nocturnal penile tumescence, Narcolepsy.", 'role': 'assistant'}]