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': 'Blind spot enlargement indicates: \nSelect and explain. \nA. Retinal detachment, B. Avulsion of optic nerve, C. Papilloedema, D. Papillitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: c papilloedema refkhurana 3rd/e p. 286', 'role': 'assistant'}]