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
Spring catarrh may be associated with: 
Select and explain. 
A. Anterior subcapsular cataract, B. Keratoconus, C. Interstitial keratitis, D. All of the above
B: Keratoconus
Answer: B: Keratoconus 
Explanation: Ans. Keratoconus