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: Medicine
[{'content': 'Which is not a characteristic of paradoxical sleep- \nSelect and explain. \nA. High heart rate, B. High B.P., C. High respiratory rate, D. Muscle hypertonia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]