This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuro-ophthalmology, Subject name: Ophthalmology
[{'content': "Field defect seen in papilloedema \nSelect and explain. \nA. Seidel's scotoma, B. Constriction of peripheral fields, C. Centro-caecal scotoma, D. Altitudinal hemianopia", 'role': 'user'}, {'content': "Answer: B \nExplanation: In papilloedema, as the condition progresses vision worsens with an enlargement of the blind spot owing to separation of the retina around the disc by the oedema and a progressive contraction of the visual field due to atrophy of the optic nerve. Ref: Parson's 22 nd edition, page no. 352", 'role': 'assistant'}]