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': 'Osgood Shattiler disease - \nSelect and explain. \nA. Involve the knee joint, B. Pelvis, C. Wrist joint, D. Cervical spine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Osgood-shaltter disease is osteochondritis of tibial tuberosity (just below the knee joint).', 'role': 'assistant'}]