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': "Field defect seen in papilledema - \nSelect and explain. \nA. Seidel's scotoma, B. Constriction of peripheral fields, C. Centro-caecal scotoma, D. None of the above", 'role': 'user'}, {'content': 'Answer: B \nExplanation: In papilloedema, there is enlargement of blind spot and progressive constriction of visual field (visual field becomes smaller).', 'role': 'assistant'}]