A 75-year-old man is admitted with severe pneumonia and requires intravenous Gentamicin (once-daily dosing regimen). When should the serum Gentamicin level be measured to guide dosing adjustments according to the Hartford nomogram?AImmediately before the first dose (trough level)B1 hour after the start of the infusion (peak level)C6-14 hours after the start of the infusionDImmediately before the second dose (trough level)E48 hours after the first doseCheck my answer