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': 'Epidemics of conjunctivitis are known to occur with: \nSelect and explain. \nA. Bacterial infections, B. Viral infections, C. None of the above, D. Both of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Both of the above', 'role': 'assistant'}]