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': 'Excision of the head of the radius in a child should not be done because : \nSelect and explain. \nA. It produces instability of elbow joint, B. It leads to secondary osteoarthritis of elbow, C. It causes subluxation of inferior radio-ulnar joint, D. It causes myositis ossificans', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Complications of radial head excision in children :\n\nProximal migration of radius with inferior radio - ulnar (distal radio - ulnar) joint instability.\nPostero-lateral instability.\nCubitus valgus deformity.', 'role': 'assistant'}]