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': 'The best advantage can be derived if orthodontic treatment is started \nSelect and explain. \nA. After puberty, B. Early adolescent period, C. At or just after onset of puberty, D. None of above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]