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
The space maintainer which is contraindicated in a child
suffering from sub acute bacterial endocarditis is 
Select and explain. 
A. Removable, B. Crown and loop, C. Band and Loop, D. Distal shoe
D: Distal shoe
Answer: D: Distal shoe 
Explanation: None