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
Tubular maximum for kidney in practice is actually less than the calculated value because ? 
Select and explain. 
A. Different nephrons have different transpo maximum, B. Depends on GFR, C. Depends on renal blood flow, D. Depends on blood Pressure
A: Different nephrons have different transpo maximum
Answer: A: Different nephrons have different transpo maximum 
Explanation: A i.e., Different nephrons have different transpo maximum