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 conjunctivitis are –a) Shield ulcerb) Horner–Trantas spotsc) Papillary hypertrophy d) Herbert pitse) Pannus \nSelect and explain. \nA. ab, B. bc, C. abc, D. bcd', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Conjunctival signs of spring catarrh\n\n.Palpebral form: Papillary hypertrophy, cobblestone appearance (Pavement stone appearance).\nBulbar form: Dusky triangular congestion, gelatinous thickening around limbus, Horner - Tranta\'s spot. Corneal signs (vernal keratopathy)\n\n\nPunctate epithelial keratitis\nUlcerative vernal keratitis: shallow transverse ulcer (Shield ulcer)\nVernal corneal plaques\nSubepithelial scarring\nPseudogerontoxon: characterized by a classical "cupid\'s bow" outline.', 'role': 'assistant'}]