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': 'A boy age 8 years came to your dental clinic with no crowding in both arches. Lateral cephalogram reveals SNA angle of 78 and SNB angle of 82 the line of treatment is \nSelect and explain. \nA. Reverse pull head gear with chin cap, B. Frankel III (n) reverse activator, C. Surgery in both maxilla and mandible followed by definite orthodontic treatment, D. Extraction followed by orthodontic treatment', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]