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': 'Bitemporal hemianopia is associated with lesions of the \nSelect and explain. \nA. Central chiasma, B. Lateral pas of chiasrna, C. Optic radiation, D. Optic tract', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sagittal (central) lesions of the chiasma These are characterised by bitemporal hemianopia and bitemporal hemianopic paralysis of pupillary reflexes. These usually lead to paial descending optic atrophy. Common causes of central chiasmal lesion are: suprasellar aneurysms, tumours of pituitary gland, craniopharyngioma, suprasellar meningioma and glioma of third ventricle, third ventricular dilatation due to obstructive hydrocephalus and chronic chiasmal arachnoiditis. Ref:- A K KHURANA; pg num:-290', 'role': 'assistant'}]