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': 'Homonymus hemianopia may be seen in lesion of all of the following, except: \nSelect and explain. \nA. Optic nerve, B. Optic chiasma, C. Optic tract, D. Optic radiation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Optic nerve', 'role': 'assistant'}]