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': 'Typical field defect observed in anterior ischaemic optic neuropathy is: \nSelect and explain. \nA. Altitudinal hemianopia, B. Paracentral scotoma, C. Homonymous hemianopia, D. Baring of the blind spot', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Altitudinal hemianopia', 'role': 'assistant'}]