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
What is the wavelength of visible light used for curing light cure resin restorations? 
Select and explain. 
A. 400-420nm, B. 420-475nm, C. 300-370nm, D. 475-500nm
B: 420-475nm
Answer: B: 420-475nm 
Explanation: None