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
What  is  the  glomerular  filtration  rate (GFR)? 
Select and explain. 
A. 25 mL/min, B. 50 mL/min, C. 100 mL/min, D. 125 mL/min
D: 125 mL/min
Answer: D: 125 mL/min 
Explanation: None