the graph below illustrates the relationship between the plasma concentration of a substan
The graph below illustrates the relationship between the plasma concentration of a substance X and its reabsorption by the kidney. The GFR is 100 ml/min. The renal threshold for this substance is
A、50 mg/dl
B、100 mg/dl
C、150 mg/dl
D、200 mg/dl
E、500 mg/dl