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
Material used as sealants: 
Select and explain. 
A. Cyanoacrylate, B. Polyurethane, C. Dimethacrylate, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Materials used as sealants:

Cyanoacrylates
Polyurethanes
Dimethacrylates
Glass ionomer