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': 'Enlargement of blind spot is a sign of: \nSelect and explain. \nA. Avulsion of optic nerve, B. Papillitis, C. Papilledema, D. Retinal detachment', 'role': 'user'}, {'content': "Answer: C \nExplanation: Concentric enlargement of blind spot is the most common visual field defect in patients with papilledema.Compression,detachment ,and lateral displacement of the peripapillary retina appears to be the major reasons that the blind spot increases in size in patients with papilledema. Ref : Riordan-Eva P. (2011). Chapter 3. Ophthalmic Emergencies. In P. Riordan-Eva, E.T. Cunningham, Jr. (Eds), Vaughan & Asbury's General Ophthalmology, 18e.", 'role': 'assistant'}]