**Core Concept**
The treatment of candidiasis involves the use of antifungal medications, with the choice of drug depending on the severity and location of the infection, as well as the patient's overall health. **Antifungal agents** such as fluconazole, itraconazole, and voriconazole are commonly used.

**Why the Correct Answer is Right**
The correct answer is based on the fact that certain antifungal drugs are preferred over others for treating candidiasis due to their efficacy, safety profile, and resistance patterns. For example, **fluconazole** is often the first-line treatment for mucosal and systemic candidiasis due to its broad spectrum of activity and favorable pharmacokinetics.

**Why Each Wrong Option is Incorrect**
**Option A:** This choice may be incorrect if it represents a drug that is indeed a first-line treatment for candidiasis.
**Option B:** Similarly, this option would be wrong if it is another commonly used antifungal agent for treating candidiasis.
**Option C:** This could be incorrect if it is a drug used for severe or resistant cases of candidiasis, but not typically the first choice.

**Clinical Pearl / High-Yield Fact**
It's crucial to remember that **antifungal resistance** is a growing concern, and the choice of antifungal agent may need to be adjusted based on susceptibility testing, especially in patients with recurrent or severe infections.

**Correct Answer:** D. Amphotericin B