**Core Concept**
The treatment of fungal infections, particularly those affecting the nails, requires topical antifungal agents that can penetrate the nail plate and reach the underlying fungal colonies. The ideal agent should have good absorption and retention in the nail.

**Why the Correct Answer is Right**
Terbinafine is a synthetic allylamine antifungal agent that is widely used as a topical nail lacquer for the treatment of onychomycosis (fungal infections of the nails). It works by inhibiting the enzyme squalene epoxidase, which is essential for the biosynthesis of ergosterol in fungal cell membranes. This leads to the accumulation of squalene, which is toxic to the fungal cells. Terbinafine has good absorption and retention in the nail, making it an effective treatment for onychomycosis.

**Why Each Wrong Option is Incorrect**
**Option A:** None provided.
**Option B:** Griseofulvin is an antifungal agent, but it is not used as a nail lacquer. It is used orally to treat fungal infections of the skin, hair, and nails, but it has poor absorption and is not effective for onychomycosis.
**Option C:** Amphotericin B is an antifungal agent, but it is not used as a nail lacquer. It is used intravenously to treat severe fungal infections, such as cryptococcal meningitis.

**Clinical Pearl / High-Yield Fact**
Mnemonically, remember that Terbinafine is used for "TOE" (tinea unguium or onychomycosis) infections.

**Correct Answer: C. Amphotericin B**