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': 'Preauricular lymph nodes may be enlarged in all except: \nSelect and explain. \nA. Bacterial conjunctivitis, B. Viral conjunctivitis, C. Allergic conjunctivitis, D. Chlamydial conjunctivitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans., Allergic conjunctivitis', 'role': 'assistant'}]