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': "A/E seen in spring catarrh – \nSelect and explain. \nA. Follicles, B. Pseudogerontoxon, C. Shield's ulcer, D. Tranta's spot", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]