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': 'Gamma waves of REM sleep in sleep cycle are associated with ? \nSelect and explain. \nA. Intense attention, B. Subconscious thinking, C. Deep subconscious thinking, D. Deep sleep', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Intense attentionBeta and gamma waves (20-80Hz) occur spontaneously during REM sleep and waking and are evoked by intense attention, conditioned responses, tasks requiring fine movements and sensory stimulus', 'role': 'assistant'}]