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 keratoconjunctivitis are – a) Papillary hypertrophyb) Follicular hypertrophyc) Herbert's pitsd) Tantra\'s Spote) Ciliary congestion 
Select and explain. 
A. b, B. c, C. ac, D. ad
D: ad
Answer: D: ad 
Explanation: Papillary hypertrophy into polygonal papilla is arranged in cobblestone or pavement stone fashion.