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
Maxwell Lyon sign is seen in: 
Select and explain. 
A. Spring catarrh, B. Dendritic ulcerative keratitis, C. Symphathetic ophthalmitis, D. Angular conjunctivitis
A: Spring catarrh
Answer: A: Spring catarrh 
Explanation: Spring catarrh