This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conjunctiva, Subject name: Ophthalmology
[{'content': 'Shield ulcer is seen in - \nSelect and explain. \nA. Phylectenular conjunctivitis, B. Spring Cattarrh, C. Mycotic corneal ulcer, D. Herpetic ulcer', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Impoant signs of spring catarrh Conjunctival Corneal Palpebral Bulbar $? Papillary hyperophy into polygonal $? Gelatinous thickening around $? Punctate epithelial keratitis papilla limbus $? Ulcerative vernal kratitis : shallow $? Giant papilla (Cauliflower $? Ducky red triangular congestion $? Pseudogerontoson : Characterized by a classical "cupid\'s bow" outline. excrescence) Ref: Parson\'s 22nd/e p.180-181 & 21st/e p.178; Khurana 7th/e p.81 & 4th/e p.74,75', 'role': 'assistant'}]