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': 'a-rhythm is seen in: \nSelect and explain. \nA. Sleep with eyes closed with mind wandering, B. Mental activity, C. Awake with eyes open, D. REM sleep', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Awake with eyes open', 'role': 'assistant'}]