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 indicative of - \nSelect and explain. \nA. Papillitis, B. Papilloedema, C. Avulsion of optic nerve, D. Retinal detachment', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]