A nurse is caring for a client who has varicella-zoster virus. Which of the following medications should the nurse expect to administer?

A. Mostly cloudy: This option does not refer to a medication and is therefore irrelevant in this context. B. Acyclovir: This is the correct medication for treating varicella-zoster virus, as it is an antiviral drug effective in managing symptoms and reducing the duration of the infection. C. Vancomycin: This antibiotic is used to treat serious bacterial infections and is not indicated for viral infections like varicella-zoster. D. Gentamicin: This is an aminoglycoside antibiotic that is ineffective against viral infections and is used primarily for bacterial infections. E. Quinine: This medication is used to treat malaria and is not relevant for varicella-zoster virus treatment.