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
Features of vernal conjunctivitis are: 
Select and explain. 
A. Shield ulcer, B. Horner-Tranta's spots, C. Papillary hyperophy, D. All
D: All
Answer: D: All 
Explanation: Ans. A, B and C