A nurse is caring for a child who is allergic to penicillin. Which of the following medications should the nurse identify as contraindicated for the child?

A. Gentamicin sulfate is an aminoglycoside antibiotic and is not chemically related to penicillin; it is not contraindicated. B. Amphotericin B is an antifungal and does not share cross-reactivity with penicillin. C. Erythromycin is a macrolide antibiotic and is safe for clients with penicillin allergy. D. Amoxicillin-clavulanate is a penicillin derivative and is contraindicated in children with a known penicillin allergy due to the risk of an allergic reaction.