Consider a drug which is exogenous to the body. The drug is filtered, but not secreted, reabsorbed, or metabolised by the kidneys. The drug is constantly infused in a patient to maintain a plasma concentration of 2mg/L. 24 hour urine collection shows the drug being excreted at a rate of 400µg/min. What is this patient's GFR? 50ml/min 100ml/min 150ml/min 200ml/min O 400ml/min

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