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 space maintainer which is contraindicated in a child\nsuffering from sub acute bacterial endocarditis is \nSelect and explain. \nA. Removable, B. Crown and loop, C. Band and Loop, D. Distal shoe', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]