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
[{'content': 'All of the following statements about synovial fluid are true, Except - \nSelect and explain. \nA. Secreted primarily by type A synovial cells, B. Follows Non - Newtonian fluid kinetics, C. Contains hyaluronic acid, D. Viscosity is variable', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Synovial fluid is secreted by type B synovial cells (type B synoviocytes).\nThe viscous and lubricating property of synovial fluid is attributed to hyaluronic acid.\nSynovial fluid is a non-newtonian thixotropic fluid and its viscosity is variable : viscosity decreases with increased rates of shear (increased speed of joint movement).', 'role': 'assistant'}]