This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Skin
[{'content': 'What is the wavelength of UV rays used in Woods lamp? \nSelect and explain. \nA. 360 nM, B. 460 nM, C. 660 nM, D. 760 nM', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. 360nMA Wood\'s lamp generates 360-nm ultraviolet (or "black") light produced by a mercury vapor source passed through a nickel oxide filter that can be used to aid the evaluation of certain skin disorders.', 'role': 'assistant'}]