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': 'In EEG, alpha wave denotes: September 2009 \nSelect and explain. \nA. REM sleep, B. Awake and eye closed and mind wandering, C. Sleep with eyes closed, D. Mental activity', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Awake and eye closed and mind wandering', 'role': 'assistant'}]