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
Best retainer advised after the closure of midline
diastema is 
Select and explain. 
A. Hawley's retainer, B. Hawley's retainer with finger spring, C. Positioner, D. Bonded retainer
D: Bonded retainer
Answer: D: Bonded retainer 
Explanation: None