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
Drug of choice for Spring Catarrah is 
Select and explain. 
A. Topical Steroids, B. Palivizumab, C. Olopatiadine, D. Sodium chromoglycate
C: Olopatiadine
Answer: C: Olopatiadine 
Explanation: Drug of choice for Spring Catarrah is Olopatiadine.