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': 'Cervident is an example of which generation bonding agent? \nSelect and explain. \nA. First, B. Second, C. Third, D. Fourth', 'role': 'user'}, {'content': 'Answer: A \nExplanation: FIRST – Contains NPG GMA-N phenyl glycine glycidyl meth acrylate.\xa0\nMechanism of bonding is by chelating with calcium.\n\nEg cervident ,cosmic bond.\xa0\n\nDisadvantage; poor bond strength 1-3 MPA.\xa0\nHydrolysis of bond in oral environment and poor clinical results.', 'role': 'assistant'}]