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': 'Lesion in the optic chiasma causes \nSelect and explain. \nA. Bitemporal hemianopia, B. Upper nasal, C. Lower nasal, D. Upper temporal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Bitemporal hemianopia', 'role': 'assistant'}]