This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Retina, Subject name: Ophthalmology
[{'content': 'Diagnosis of the fundus examination: \nSelect and explain. \nA. Papillitis, B. Papilledema, C. Cupping of the disk, D. Silver wire appearance', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Papilledema.', 'role': 'assistant'}]