This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Arthritis, Subject name: Orthopaedics
[{'content': 'Which can cause loose body in the joint - \nSelect and explain. \nA. RA, B. Ankylosing spondylitis, C. OA, D. SLE', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., OA o Causes of loose bodies includei) Osteoarthritisiii) Osteochondral fracture (injury) v) Synovial chondromatosisii) Osteochondritis dessicansiv) Charcot's disease o Among these, osteochondral fracture causes single loose bodies, while all other can cause multiple loose bodies, maximum by synovial chondromatosis (up to hundrades).", 'role': 'assistant'}]