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': 'The wavelength of diode laser is: \nSelect and explain. \nA. 637 nm, B. 1064 nm, C. 670 nm, D. 515 nm', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]