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': 'The liquid component of hybrid ionomer cements usually contains a water solution of: \nSelect and explain. \nA. HEMA, B. Polyacrylic acid, C. Polyacrylic acid modified with methacrylate, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The\xa0liquid\xa0component\xa0of\xa0hybrid\xa0ionomer\xa0cements\xa0usually contains\xa0a\xa0water\xa0solution\xa0of\xa0polyacrylic\xa0acid,\xa0HEMA,\xa0and\xa0polyacrylic\xa0acid\xa0modified\xa0with\xa0methacrylate.\xa0\nThe\xa0powder component contains fluoroaluminosilicate glass particles of a\xa0conventional\xa0GIC\xa0plus initiators, such\xa0as\xa0camphorquinone, for light curing and/or chemical curing. The acid-base reaction begins upon mixing and continues after polymerization at a much slower rate than for conventional GICs, because less\xa0water is present and the reaction is much slower in the solid phase than in the liquid phase.\nRef: Phillip’s Science of Dental Materials ed 12 pg 326', 'role': 'assistant'}]