This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Pharmacology
[{'content': 'Regarding the antibacterial action of gentamicin, which of the following statements is most accurate? \nSelect and explain. \nA. Efficacy is directly propoionate to the time that the plasma level of the drug is greater than the minimal inhibitory concentration, B. Gentamicin continues to exe antibacterial effects even after plasma levels decrease below detectable range, C. Antibacterial activity is often reduced by the presence of an inhibitor of cell wall synthesis, D. The antibacterial action of gentamicin is time dependent', 'role': 'user'}, {'content': 'Answer: C \nExplanation: (Ref:Katzung 10/e p756, 757) Aminoglycosides show concentration dependenbt killing and prolonged post antibiotic effect. For details, refer to text.', 'role': 'assistant'}]