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': 'Drug of choice for Spring Catarrah is \nSelect and explain. \nA. Topical Steroids, B. Palivizumab, C. Olopatiadine, D. Sodium chromoglycate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Drug of choice for Spring Catarrah is Olopatiadine.', 'role': 'assistant'}]