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': 'True about osteoarthritis \nSelect and explain. \nA. Increased hydration of articular cartilage, B. Decreased proteolytic enzmyes of articular cartilage, C. Increased ESR, D. Decreased viscosity of synovial fluid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]