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': 'Unilateral conjunctivitis is commonly seen in: \nSelect and explain. \nA. Blepharitis, B. Vernal conjunctivitis, C. Dacryocystitis, D. Trachoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Dacryocystitis', 'role': 'assistant'}]