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': 'Specific θ waves are seen in \nSelect and explain. \nA. NREM 1, B. NREM 2, C. NREM 3, D. REM', 'role': 'user'}, {'content': 'Answer: D \nExplanation: θ waves are seen in both\xa0NREM 1 & REM.\nBut specific θ\xa0waves indicate hippocampal activity seen in REM phase of sleep.', 'role': 'assistant'}]