**Core Concept**
Fusarium infections are a type of fungal infection caused by the Fusarium species, which can lead to various diseases in humans, including keratitis, onychomycosis, and disseminated infections. Topical antifungals are often used to treat these infections, but the choice of antifungal depends on the causative organism.

**Why the Correct Answer is Right**
The correct answer is a topical antifungal that is effective against Fusarium species. This is because it inhibits the growth of fungi by interfering with their cell membrane function. Specifically, it targets the ergosterol biosynthesis pathway, which is essential for fungal cell membrane integrity. By inhibiting this pathway, the antifungal disrupts the cell membrane, ultimately leading to fungal cell death.

**Why Each Wrong Option is Incorrect**
**Option A:** This antifungal is more effective against yeast infections, such as candidiasis, and is not the preferred choice for treating Fusarium infections.
**Option B:** This antifungal is used to treat bacterial infections, not fungal infections, making it an incorrect choice for treating Fusarium infections.
**Option C:** This antifungal is not typically used topically and is more often associated with systemic fungal infections.

**Clinical Pearl / High-Yield Fact**
When treating fungal infections, it's essential to choose an antifungal that is effective against the specific causative organism. In the case of Fusarium infections, a topical antifungal that targets the ergosterol biosynthesis pathway is the most effective treatment option.

**Correct Answer:** C. Clotrimazole.