question: Q:A 51-year-old man is admitted to the hospital because of a 2-day history of fever, nausea, and abdominal pain. His temperature is 39.4°C (102.9°F) and pulse is 106/min. Physical examination shows tenderness in the right upper quadrant. Blood cultures grow nonhemolytic, gram-positive cocci that grow in hypertonic saline. Antibiotic sensitivity testing of the isolated organism shows that gentamicin has a minimum inhibitory concentration (MIC) of 16 μg/mL. The addition of ampicillin, which has an MIC of 2 μg/mL alone, decreases the MIC of gentamicin to 0.85 μg/mL. The decrease in the MIC of gentamicin with the addition of ampicillin is most likely due to which of the following mechanisms?? 
  {'A': 'Additive bacteriostatic effect of ampicillin', 'B': 'Increase in the intracellular uptake of gentamicin', 'C': 'Stabilization of gentamicin binding at the target site', 'D': 'Inhibition of the acetylation of gentamicin', 'E': 'Sequential block of essential micronutrient synthesis'},