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. Follows Non - Newtonian fluid kinetics, B. Secreted primarily by type A synovial cells, C. Contains hyaluronic acid, D. Viscosity is variable
B: Secreted primarily by type A synovial cells
Answer: B: Secreted primarily by type A synovial cells 
Explanation: synovial fluid is plasma transudate from synovial capillaries, modified by secretory activities of type-B synovial lining cells.