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': 'Spring catarrh is – \nSelect and explain. \nA. Type I hypersensitivity reaction, B. Type II hypersensitivity reaction, C. Type III hypersensitivity reaction, D. Type IV hypersensitivity reaction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Spring catarrh is a type I hypersensitivity to exogenous allergens.', 'role': 'assistant'}]