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': 'In EEG, delta waves are seen: \nSelect and explain. \nA. Due to reticular system, B. When the thalamus is cut off from pons, C. In deep sleep Type, D. These originate from thalamocortical area', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. In deep sleep Type Frequency (Hz)LocationNormallyPathologicallyDeltaup to 3frontal, high amplitude (20- 200uV)Adults*deep sleep* infants* subcortical lesions* diffuse lesionsTheta4-7 HzParietal and temporal regions* young children*drowsiness (early sleep)* focal subcortical lesionsAlpha8 -12 HzParietal and occipital (50- 100 uV)* closing the eyes and by relaxation.Frequency decreases in: hypoglycemia, hypothermia, hypercapnia, GA, sleep, comaBeta12 - 30 HzFrontal region; low amplitude waves 10 uV* active, busy or anxious thinking, active concentration* sedatives', 'role': 'assistant'}]