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
Unilateral conjunctivitis is commonly seen in: 
Select and explain. 
A. Blepharitis, B. Vernal conjunctivitis, C. Dacryocystitis, D. Trachoma
C: Dacryocystitis
Answer: C: Dacryocystitis 
Explanation: Ans. Dacryocystitis