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: Orthopaedics
All of the following statements about synovial fluid are true, Except - 
Select and explain. 
A. Secreted primarily by type A synovial cells, B. Follows Non - Newtonian fluid kinetics, C. Contains hyaluronic acid, D. Viscosity is variable
A: Secreted primarily by type A synovial cells
Answer: A: Secreted primarily by type A synovial cells 
Explanation: Synovial fluid is secreted by type B synovial cells (type B synoviocytes).
The viscous and lubricating property of synovial fluid is attributed to hyaluronic acid.
Synovial fluid is a non-newtonian thixotropic fluid and its viscosity is variable : viscosity decreases with increased rates of shear (increased speed of joint movement).