This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Special Senses: Vision and its Elements, Subject name: Physiology
[{'content': 'Bitemporal hemianopia is seen in lesion of \nSelect and explain. \nA. Optic tract, B. Optic chiasma, C. Optic nerve, D. Occipital lobe', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (B) Optic chiasma > Bitemporal hemianopsia - The loss of the fields closest to the temples.Bitemporal hemianopsia most commonly occurs as a result of tumors located at the mid-optic chiasm.> Since the adjacent structure is the pituitary gland, some common tumors causing compression are pituitary adenomas, and craniopharyngiomas.> Also another relatively common neoplastic etiology is meningiomas. An etiology of vascular origin is an aneurysm of the anterior communicating artery which arise superior to the chiasm, enlarge, and compress it from above.', 'role': 'assistant'}]