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: Surgery
[{'content': "Snowstorm appearance of knee joint with multiple loose bodies are seen in? \nSelect and explain. \nA. Chondromalacia patellae, B. Ewing's sarcoma of knee joint, C. Fracture involving aicular surface, D. Synol chondromatosis", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Most common cause of snowstorm appearence of knee joint with multiple loose bodies is synol chondromatosis. Most common cause of loose bodies in adolescents is Osteochondritis dessicans. Most common cause of loose bodies in elderly is Osteoahritis.', 'role': 'assistant'}]