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': '3 point symmetry is not disturbed in which fracture- \nSelect and explain. \nA. Fracture ulna only, B. Fracture radius only, C. Fracture of radius & ulna both bones of forearm, D. Weak posterior capsule', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Actually, no option is correct (see previous two explanations). But I will have to find out the answer for you : -\nIf ulna fracture involves olecranon than the three-point bony relationship can be disturbed. This can occur either in isolated ulna fracture (option a) or ulna fracture with radium (option c).\n\n\nThe weak posterior capsule can cause dislocation of the elbow in which three bony point relationship is disturbed.\nIsolated radius fracture will not alter three bony point relationship.', 'role': 'assistant'}]