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': 'What is urethane dimethacrylate resin based sealer: \nSelect and explain. \nA. Endorez, B. Tubliseal, C. Realseal, D. Sealapex', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Endorez is a visible - light curable urethane dimethacrylate gn\xa0 based sealer. It is hydrophilic and penetrates deep into dentinal tubules thereby reducing the microbial leakage.', 'role': 'assistant'}]