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: Pediatrics
[{'content': 'All 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. Precipitation by hyperventilation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: "Absence seizures are characterized by sudden brief lapse of consciousness without loss of postural control. The seizure typically lasts for only seconds, consciousness returns as suddenly as it was lost and there is no postural confusion". - Harrison\nAbsence seizures: (Petitmal seizures)\n\nBegin in childhood (4-8 years) or early adolescence and are the main seizure type in children with epilepsy.\nThere is sudden brief loss of consciousness, which lasts for a few seconds.\nNo loss of posture \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\nNo breathing difficulty\nNo incontinence of urine or stool\nMay be accompanied by subtle bilateral motor signs such as\nRapid blinking of eyelids \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\nSmall amplitude clonic movements of the hands\nChewing movements\nAbsence seizures may occur in multiple every day (can occur hundreds of times per day)\nThe electrophysiological hallmark of typical absence seizure is a generalized symmetric 3 Hz spike and slow wave discharge that begins and ends suddenly on a normal EEG background.\nHyperventilation tends to provoke these electrographic discharge and even the seizure themselves and is routinely used when recording the EEG.\nHyperventilation often precipitates the attacks.\nDrug of choice for absence seizures is Valproate (Previously it was ethosuxamide).', 'role': 'assistant'}]