**Core Concept**
Mucormycosis is a rare but life-threatening fungal infection caused by fungi of the order Mucorales. The treatment of mucormycosis involves antifungal medications, and among azoles, only a specific compound has been shown to be effective.

**Why the Correct Answer is Right**
Posaconazole is a triazole antifungal agent that has been approved for the treatment of mucormycosis. It works by inhibiting the cytochrome P450-dependent enzyme lanosterol 14α-demethylase, which is essential for the conversion of lanosterol to ergosterol in the fungal cell membrane. This leads to the accumulation of toxic sterol precursors and ultimately results in fungal cell death. Posaconazole has been shown to be effective in treating mucormycosis, especially in patients with hematological malignancies or those who have undergone hematopoietic stem cell transplantation.

**Why Each Wrong Option is Incorrect**
**Option A:** Voriconazole is another triazole antifungal agent but is not approved for the treatment of mucormycosis. It is effective against a broader range of fungi, including Aspergillus species, but has limited efficacy against Mucorales.

**Option B:** Fluconazole is a triazole antifungal agent that is primarily used to treat candidiasis. It has limited activity against Mucorales and is not effective in treating mucormycosis.

**Option C:** Itraconazole is a triazole antifungal agent that is effective against a range of fungi, including Aspergillus species and some Mucorales. However, it is not the preferred treatment for mucormycosis due to its limited efficacy and potential toxicity.

**Clinical Pearl / High-Yield Fact**
When treating mucormycosis, it is essential to use posaconazole as part of a comprehensive treatment plan that includes surgical debridement and supportive care. Posaconazole should be initiated as soon as possible after diagnosis, and its use should be continued for at least 12 weeks to minimize the risk of relapse.

**Correct Answer: C. Itraconazole is a triazole antifungal agent that is effective against a range of fungi, including Aspergillus species and some Mucorales. However, it is not the preferred treatment for mucormycosis due to its limited efficacy and potential toxicity.