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': 'To prevent keratoconus what is used – \nSelect and explain. \nA. Antibiotics, B. Cycloplegics, C. Glasses, D. None', 'role': 'user'}, {'content': 'Answer: D \nExplanation: There are no preventive measures for keratoconus.\nSome specialists believe that patient with keratoconus should have their eye allergies aggressively treated and should be instructed not to rub their eyes', 'role': 'assistant'}]