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': 'Gennifer, a 4 years got her lower 2nd molar extracted due\nto caries, the possible Line of treatment is \nSelect and explain. \nA. Distal shoe space maintainer, B. Band and loop between primary 1st molar and permanent 1st molar, C. Removable partial denture, D. No active treatment is necessary', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]