26. If the rate of urine formation is 2 mI/min, the urine inulin concentration is 25 mg'ml, and the plasma inulin concentration 0.5 mg/ml, then the GFR is
(A) 0.04 ml/min
(B) 6.25 ml/min
(C) 100ml/min
(D) 25 ml/min

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