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': 'Which of the following initiator accelerator system uses light activation composite? \nSelect and explain. \nA. Diketone-amine, B. Organic acid-metal oxide, C. Organic acid-peroxide, D. Peroxide-amine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The light-cure process is activated when a diketone photosensitizer such as camphorquinone (CQ) absorbs a quantum of blue light and forms an excited-state complex (exciplex) with an electron donor such as an amine (e.g., dimethylaminoethyl methacrylate ).\nWhile in this activated complex, CQ extracts a hydrogen atom from the α-carbon adjacent to the amine group, and the complex decomposes into amine and CQ free radicals. The CQ free radical is readily inactivated.\xa0\xa0\nThus, in photoinitiation only the amine free radicals act to initiate the addition polymerization reaction.\nReference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, 12th ed page no 289', 'role': 'assistant'}]