A client exposed to anthrax has presented to the healthcare setting. Which of the following medications below is the treatment for this biological exposure?

A. Ciprofloxacin is a fluoroquinolone antibiotic that is effective against Bacillus anthracis, the bacterium that causes anthrax. It is often used as a first-line treatment for exposure to anthrax, especially in its inhalational form. B. While amoxicillin/clavulanate can treat certain infections, it is not the preferred treatment for anthrax. It is less effective against anthrax compared to ciprofloxacin. C. Nystatin is an antifungal medication used to treat fungal infections and is not indicated for anthrax treatment. D. Metronidazole is primarily used for anaerobic bacterial and protozoal infections, making it inappropriate for treating anthrax.