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:: (A) Typical optic neuritis, (B) Acute Papilledema, (C) Toxic optic neuropathy, (D) Leber's hereditary optic neuropathy
Answer is D. D. i.e. Leber's hereditary optic neuropathy