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
In clinical practice, Glomerular Filtration Rate (GFR) is estimated using the plasma clearance value of 
Select and explain. 
A. Inulin, B. PAH, C. Glucose, D. Creatinine
D: Creatinine
Answer: D: Creatinine 
Explanation: None