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': 'Material used as sealants: \nSelect and explain. \nA. Cyanoacrylate, B. Polyurethane, C. Dimethacrylate, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Materials used as sealants:\n\nCyanoacrylates\nPolyurethanes\nDimethacrylates\nGlass ionomer', 'role': 'assistant'}]