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
[{'content': 'Field defect seen in pituitary adenoma: \nSelect and explain. \nA. Bitemporal hemianopia, B. Binasal hemianopia, C. Quadrantanopia, D. "Pie in sky" defect', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Bitemporal hemianopia Pituitary gland tumors, craniopharyngeoma & suprasellar aneurysms compress central chiasma and present with bitemporal hemianopia Q', 'role': 'assistant'}]