# Which of the following initiator/accelerator systems is needed for a light activated composite?
A. Peroxide amine
B. Diketone amine
C. Organic acid –peroxide
D. Organic acid- metal ion
The correct answer is B. Diketone Amine.
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 [DMAEMA]).
Ref: Phillip’s science of Dental Materials, 12th Edition, Page no. 289
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