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': 'All are the 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: None', 'role': 'assistant'}]