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: Unknown
[{'content': 'Infra -red rays causes : \nSelect and explain. \nA. Cataract, B. Keratitis, C. Optic neuritis, D. Glaucoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Infra red rays affects primarily the retina, because of the transparency of the ocular media.\nWhen directly viewing a point surce or laser beam, the focusing properties in the IRA region additionally render the retina much more susceptible to damage than any other part of the body.\nFor short exposure periods, heating of the iris from the absorption of visible or near infrared is considered to play a role in the development of opacities in the lens.', 'role': 'assistant'}]