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
As compared to UV light, visible light can cure: 
Select and explain. 
A. Greater depth of resin, B. Lesser depth of resin, C. Only superficial layer, D. None of the above
A: Greater depth of resin
Answer: A: Greater depth of resin 
Explanation: Although the polymerization reaction was under the direct control of the clinician, the inability of these short UV wavelengths to penetrate deeply into the resin composite meant that the incremental layers of resin could be at most 1 mm thick.
Blue light can penetrate deeper into the resin than UV or violet light, such that some “blue light–cured” restorations can now be adequately light cured in increments that are up to 5-mm thick.
Phillips Dental materials 12th edition pg no 174