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 light used in light cure system: \nSelect and explain. \nA. 400nm, B. 474nm., C. 500nm, D. Any of the above.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The range is 400-500nm.\nBut if question has been asked for specific wavelength then 474nm is more appropriate.', 'role': 'assistant'}]