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': 'Vitamin B12 deficiency is likely to cause: \nSelect and explain. \nA. Bitemporal hemianopia, B. Binasal hemianopia, C. Heteronymous hemianopia, D. Centrocecal scotoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Cetrocecal scotoma Vitamin B12 deficiency is likely to cause optic neuritis; in which most common field defect is central or centro-caecal scotoma Q', 'role': 'assistant'}]