A 13-year-old child has been diagnosed with tonsillitis and prescribed a combined sulfonamide drug with a bactericidal effect. What drug has been prescribed for the child?

• A. Trimethoprim/sulfamethoxazole
• B. Piperacillin/tazobactam
• C. Cefoperazone/sulbactam
• D. Ursodeoxycholic acid
• E. Amoxicillin/clavulanic acid