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
Typical field defect observed in anterior ischaemic optic neuropathy is: 
Select and explain. 
A. Altitudinal hemianopia, B. Paracentral scotoma, C. Homonymous hemianopia, D. Baring of the blind spot
A: Altitudinal hemianopia
Answer: A: Altitudinal hemianopia 
Explanation: Ans. Altitudinal hemianopia