This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
[{'content': 'Characteristics of Slow Wave Sleep are \nSelect and explain. \nA. Also called paradoxical slee, B. Dreams occur but not consolidated into memory, C. Heart rate & respiratory rate become irregular, D. EEG shows desynchronized pattern of b waves', 'role': 'user'}, {'content': 'Answer: C \nExplanation: (C) Heart rate and respiratory rate become irregular > Slow waves in the EEG and their behavioral correlate, slow-wave sleep, can be produced by stimulation of at least three subcortical regions.> The diencephalic sleep zone is in the posterior hypothalamus and the nearby intralaminar and anterior thalamic nuclei.> The stimulus frequency must be about 8 Hz; faster stimuli produce arousal.', 'role': 'assistant'}]