This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Which of the following are seen in deep NREM sleep: \nSelect and explain. \nA. Alfa waves, B. Beta waves, C. Teta waves, D. Delta waves', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Delta waves are seen in deep sleep Beta waves are seen in active state Alfa waves are seen in patients with decreased attention Theta waves seen in case of drowsiness', 'role': 'assistant'}]