To calculate GFR, the concentration of a marker molecule is measured in both the blood and the urine, and the total volume of urine produced is also measured. Which of the following sets of results indicates the highest GFR?
A. High concentration of the marker in the blood, high volume of urine, low concentration of the marker in the urine
B. High concentration of the marker in the blood, low volume of urine, high concentration of the marker in the blood
C. High concentration of the marker in the urine, high volume of urine, low concentration of the marker in the blood
D. High concentration of the marker in the urine, low volume of urine, high concentration of the marker in the blood
Answer: C
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