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': 'Multiple loose bodies are seen in -a) Osteochondritis dessicansb) Synovial chondromatosisc) Osteoarthritisd) Rheumatoid arthritis e) Osteogenesis imperfecta \nSelect and explain. \nA. abc, B. bc, C. acd, D. bcd', 'role': 'user'}, {'content': "Answer: A \nExplanation: Causes of loose bodies include :-\n\n\nOsteoarthritis\xa0\nOsteochondritis dessicans\nOsteochondral fracture (injury)\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\nCharcot's disease\nSynovial chondromatosis\n\n\nAmong these, osteochondral fracture causes single loose bodies, while all other can cause multiple loose bodies, maximum by synovial chondromatosis (up to hundred’s).", 'role': 'assistant'}]