This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Joint disorders, Subject name: Orthopaedics
[{'content': 'what is the most common site of loose bodies in a joint- \nSelect and explain. \nA. Knee joint, B. Hip joint, C. Elbow joint, D. Ankle joint', 'role': 'user'}, {'content': 'Answer: A \nExplanation: knee joint is most common site of loose boides ref : maheswari 9th ed', 'role': 'assistant'}]