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': 'Spring catarrh may be associated with: \nSelect and explain. \nA. Anterior subcapsular cataract, B. Keratoconus, C. Interstitial keratitis, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Keratoconus', 'role': 'assistant'}]