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 TB Knee \nSelect and explain. \nA. Synovial fluid shows reduced mucin, B. Internal rotation of Tibia, C. Synovial fluid shows reduced leucocyte count, D. Leads to Bony ankylosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]