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': 'Which of the following is not true of acute conjunctivitis? \nSelect and explain. \nA. Vision is not affected, B. Corneal infiltration, C. Topical antibiotics are the mainstay of treatment, D. Pupil remains unaffected', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. c. Topical antibiotics are the mainstay of treatment', 'role': 'assistant'}]