IF a bacteria were susceptible to both penicillin and Erythromycin, then it would not be appropriate to treat the patients with both antibiotics at the same time because_______________?

A. Erythromycin exerts its effects extracellularly

B. Penicillin is only effective against growing cells

C. Erythromycin enhances the B-lactamases activity

D. Penicillin is inactivated by erythromycin

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