This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Insulin clearance measures _______ 
Select and explain. 
A. 135 ml / min, B. 90 ml / min, C. 625 ml / min, D. 125 ml / min
D: 125 ml / min
Answer: D: 125 ml / min 
Explanation: Insulin is only filtered it is neither secreted nor reabsorbed.
Hense Insulin clearace = GFR
     = 125  ml / min