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': 'In an-8-year-old child there is insufficient space in the\nupper anterior segment for the upper permanent lateral incisors to erupt. Treatment is: \nSelect and explain. \nA. Disk the proximal surface of maxillary incisors, B. Disk deciduous canines and first molars, C. Extract the deciduous 1st molars, D. No treatment required but observe', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]