**Core Concept**
The question is testing the student's knowledge of antifungal agents and their spectrum of activity. Dermatophytosis and candidal infections are two types of fungal infections that require different treatment approaches. However, some antifungal agents have a broad spectrum of activity, making them effective against both dermatophytes and Candida species.

**Why the Correct Answer is Right**
The correct answer is a polyene antifungal agent, specifically Amphotericin B. Amphotericin B has a broad spectrum of activity against both dermatophytes and Candida species. It works by binding to the sterol component of fungal cell membranes, leading to cell death. This makes it an effective treatment option for both dermatophytosis and candidal infections. Amphotericin B is particularly useful in treating severe or life-threatening fungal infections.

**Why Each Wrong Option is Incorrect**
**Option A:** Griseofulvin is a dermatophyte-specific antifungal agent that is not effective against Candida species. It works by inhibiting microtubule synthesis, which is essential for fungal cell division.

**Option B:** Fluconazole is a triazole antifungal agent that is primarily effective against Candida species. While it may have some activity against dermatophytes, it is not the best choice for treating dermatophytosis.

**Option C:** Itraconazole is another triazole antifungal agent that has a broad spectrum of activity, but it is not as effective against dermatophytes as Amphotericin B. It is often used to treat fungal infections that are resistant to fluconazole.

**Clinical Pearl / High-Yield Fact**
When treating fungal infections, it's essential to choose an antifungal agent that is effective against the specific causative organism. Amphotericin B is a broad-spectrum antifungal agent that can be used to treat both dermatophytosis and candidal infections, but it's crucial to monitor liver function and renal function closely due to its potential toxicity.

**Correct Answer: C. Itraconazole.**