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: Surgery
[{'content': 'Ophthalmic findings in vitamin B12 deficiency are \nSelect and explain. \nA. Bitemporal hemianopia, B. Binasal hemianopia, C. Heteronymous hemianopia, D. Centrocecal scotoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: * Vitamin B12 deficiency causes optic neuropathy and impaired acuity and central scotoma * Annular or ring shaped scotoma is a typical features of Retinitis pigmentosa', 'role': 'assistant'}]