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: Ophthalmology
[{'content': 'Cataract is caused by al! except: \nSelect and explain. \nA. Ultraviolet radiation, B. M RI, C. Infrared radiation, D. Microwave radiation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. M RI', 'role': 'assistant'}]