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
Which of the following product is primarily filtered with little secretion or re-absorption in renal tubules? 
Select and explain. 
A. Sodium, B. Creatinine, C. Glucose, D. Amino acids
B: Creatinine
Answer: B: Creatinine 
Explanation: Creatinine can also be used to measure GFR as it is minimally secreted or reabsorbed in the renal tubules.