A 28-year-old man decides to donate a kidney to his brother, who is in chronic renal failure, after HLA typing suggests that he would be a suitable donor. He is admitted to the hospital, and his right kidney is removed and transplanted into his brother. Which of the following indices would be expected to be decreased in the donor after full recovery from the operation?
(A) Creatinine clearance
(B) Creatinine production
(C) Daily excretion of sodium
(D) Plasma creatinine concentration
(E) Renal excretion of creatinine