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': "Features of vernal keratoconjunctivitis are – a) Papillary hypertrophyb) Follicular hypertrophyc) Herbert's pitsd) Tantra\\'s Spote) Ciliary congestion \nSelect and explain. \nA. b, B. c, C. ac, D. ad", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Papillary hypertrophy into polygonal papilla is arranged in cobblestone or pavement stone fashion.', 'role': 'assistant'}]