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 of the following are characterisitic features of petitmal siezures except - \nSelect and explain. \nA. Short duration of seizures, B. Absence of motor activity during the seizures, C. On set after the age of 14 years, D. 3 Hz spike and wave pattern in EEG', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]