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': 'Delta waves on EEG is seen in: March 2013 (e) \nSelect and explain. \nA. Awake state with eyes open, B. Fully relaxed deep sleep, C. Awake state with eyes closed, D. Transition from awakefulness to sleep', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Fully relaxed deep sleep', 'role': 'assistant'}]