This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lesions of the Visual Pathway, Subject name: Ophthalmology
[{'content': 'The characteristic field defect seen in pituitary tumors is \nSelect and explain. \nA. Homonymous hemianopia, B. Complete vision loss, C. Binasal hemianopia, D. Bitemporal hemianopia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Bitemporal hemianopiaRef: Harrison\'s 19th ed. /198-199"Bitemporal hemianopia is usually caused by tumors in the region of the sells turcica, pressure by a suprasellar aneurysm or by chronic arachnoiditis; these press upon the chiasma so that the fibers going to thenasal halves of each retina are destroyed. Tumors of the pituitary body are most common.', 'role': 'assistant'}]