This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': 'All of the following are features of absence seizures except \nSelect and explain. \nA. Usually seen in childhood, B. 3-Hz spike wave in EEG, C. Postictal confusion, D. Preciptation by hyperventilation', 'role': 'user'}, {'content': "Answer: C \nExplanation: Harrison's textbook of internal medicine 17th edition . *Absence seizures(previously petit mal)usually sta in childhood (4-8yrs)or early adolescence *Electrophysiological hallmark is generalized,symmetrical ,3Hz spike-and-wave discharge that begins and ends suddenly,superimposed on normalEEG *Hyperventilation tend to provoke these electroencephalographic discharges *Seizure lasts only for seconds and there is no postictal confusion .", 'role': 'assistant'}]