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: Medicine
Cystatin C is a novel marker of 
Select and explain. 
A. Vitamin K Status, B. Cholestasis, C. Fatty liver, D. Glomerular filtration
D: Glomerular filtration
Answer: D: Glomerular filtration 
Explanation: None