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: Dental
[{'content': 'Aggressive periodontitis is characterized by the following\nmajor features EXCEPT \nSelect and explain. \nA. Non contributory medical history, B. Rapid attachment loss, C. Pathologic migration, D. Familial aggregation of cases', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]