Which of the following medications are considered antibiotics to treat infections? (Select All that Apply)

A. Correct: Metronidazole is an antibiotic used to treat anaerobic bacterial infections and protozoal infections. B. Correct: Ciprofloxacin is a fluoroquinolone antibiotic used for bacterial infections, including UTIs and respiratory infections. C. Incorrect: Metoprolol is a beta-blocker used for hypertension and cardiac conditions, not infections. D. Incorrect: Acyclovir is an antiviral, not an antibiotic, and is used to treat herpes simplex and varicella-zoster infections.