A kidney transplant recipient on tacrolimus develops a serum creatinine rise from 1.2 to 2.8 mg/dL on post-op day 5. The most appropriate next step is:
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A
Increase tacrolimus dose immediately
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B
Obtain a renal biopsy to differentiate rejection from tacrolimus nephrotoxicity
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C
Start high-dose IV methylprednisolone empirically
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D
Discontinue tacrolimus and switch to cyclosporine