This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fundamentals In Radiology, Subject name: Radiology
[{'content': 'Wavelength of light is \nSelect and explain. \nA. 400-700 nm, B. 500-800 nm, C. 700-900 nm, D. 300-600 nm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: a (400-700nm) Ref: Vasudevan 4th ed p. 479Wavelength of visible light is 400-700nm.Violet- 420 nmBlue- 470 nmGreen- 520 nmYellow- 580 nmRed- 680 nm', 'role': 'assistant'}]