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
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 perimetery, the cause is 
Select and explain. 
A. Optic atrophy, B. Optic neuritis, C. Toxic optic neuropathy, D. Leber's optic neuropathy
D: Leber's optic neuropathy
Answer: D: Leber's optic neuropathy 
Explanation: Disc hyperemia, periperillary telangiectasia clearly s/o leber's optic neuropathy.