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: Biochemistry
Viscosity of synovial fluid depends upon - 
Select and explain. 
A. N-acetyl galactosamine, B. N-acetyl glucosamine, C. Glucuronic acid, D. Hyaluronic acid
D: Hyaluronic acid
Answer: D: Hyaluronic acid 
Explanation: Viscosity of synovial fluid is provided by hyaluronic acid.