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': 'What is the wavelength of visible light used for curing light cure resin restorations? \nSelect and explain. \nA. 400-420nm, B. 420-475nm, C. 300-370nm, D. 475-500nm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]