This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Photosensitive disorders, Subject name: Dental
[{'content': 'Which of the following ultra-violet radiation cause most skin disorder- \nSelect and explain. \nA. UV-A, B. UV-B, C. UV-C, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cutaneous responses to uv radiation UVA -315-400nm immediate erythema Immediate pigment darkening- merowsky phenomenon drug induced photosensitivity photoageing UVB- 280-315nm 1000x more erythmogenic, associated with sunburn delayed melanogenogenesis major role in carcinogenesis role in photoageing role in vitamin d synthesis UVB has more damage to skin fitzpatrick textbook of dermatology page 267', 'role': 'assistant'}]