This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Ophthalmology
[{'content': 'Bitemporal hemianopia caused by \nSelect and explain. \nA. Pituitary adenoma, B. Basal meningioma, C. Corpus callosal tumor, D. Nasopharyngeal carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) Pituitary adenoma# Bitemporal hemianopia occurs due to pressure or lesion of optic chiasma, so that the nerve fibres going to nasal half of each retina are destroyed.> The various causes are pituitary body tumor, craniopharyngioma, suprasellar aneurysm, gliomas of third ventricle, ectopic pine alomas, dermoid tumours etc.', 'role': 'assistant'}]