Imidazole-containing antifungal drugs are a class of antifungals that have an imidazole ring in their chemical structure. Ketoconazole is a well-known example of an imidazole antifungal, used to treat fungal infections by inhibiting ergosterol synthesis, a key component of fungal cell membranes. Itraconazole and Fluconazole are triazole antifungals, which contain a triazole ring instead. Griseofulvin is not related to imidazoles or triazoles; it works by inhibiting fungal mitosis.
Thus, the correct answer is Ketoconazole.