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
Topical sodium cromoglycate is used in the treatment of – 
Select and explain. 
A. Phlyctenular conjunctivitis, B. Vernal catarrh, C. Subconjunctival haemorrhage, D. Trachoma
B: Vernal catarrh
Answer: B: Vernal catarrh 
Explanation: Mast cell stabilizers such as sodium chromoglycate drops are quite effective in controlling vernal keratoconjunctivitis.