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': "A young man with blurring of vision in right eye, followed by left eye after 3 months, showing disc hyperemia, edema, circumpapillary telangiectasia with normal pupillary response with centrocecal scotoma on perimetry, the cause is: \nSelect and explain. \nA. Typical optic neuritis, B. Acute Papilledema, C. Toxic optic neuropathy, D. Leber's hereditary optic neuropathy", 'role': 'user'}, {'content': "Answer: D \nExplanation: D. i.e. Leber's hereditary optic neuropathy", 'role': 'assistant'}]