**Core Concept**
Leber's Hereditary Optic Neuropathy (LHON) is a mitochondrial disorder characterized by a progressive loss of central vision due to optic nerve degeneration. It is primarily inherited in a maternal lineage, as only mitochondrial DNA is passed from mother to child.

**Why the Correct Answer is Right**
LHON is caused by mutations in mitochondrial DNA, which encode essential proteins for energy production in the retina. The most common mutations affect complex I (NADH dehydrogenase) and complex III (cytochrome b) of the electron transport chain. These mutations lead to impaired energy production in retinal ganglion cells, resulting in optic nerve degeneration. The disease typically affects young adult males, as they have a higher proportion of mutated mitochondria in their retinal cells.

**Why Each Wrong Option is Incorrect**
**Option A:** LHON is primarily inherited in a maternal lineage, as only mitochondrial DNA is passed from mother to child. (This statement is true for LHON, but not for the question.)
**Option B:** LHON is characterized by progressive loss of central vision due to optic nerve degeneration. (This statement is true for LHON.)
**Option C:** LHON is caused by mutations in mitochondrial DNA, which encode essential proteins for energy production in the retina. (This statement is true for LHON.)
**Option D:** LHON typically affects young adult males, as they have a higher proportion of mutated mitochondria in their retinal cells. (This statement is true for LHON.)

**Clinical Pearl / High-Yield Fact**
LHON is a classic example of a mitochondrial disorder with a significant sex bias, as young adult males are disproportionately affected due to their higher proportion of mutated mitochondria in their retinal cells.

**Correct Answer: D. LHON typically affects young adult males, as they have a higher proportion of mutated mitochondria in their retinal cells.**