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': '3 point symmetry is not disturbed in which fracture? \nSelect and explain. \nA. Fracture ulna only, B. Fracture radius only, C. Fracture of radius and ulna both bones of forearm, D. Weak posterior capsule', 'role': 'user'}, {'content': "Answer: B \nExplanation: Weak posterior capsule may disrupt three point bony relation by promoting subluxation or dislocation of elbow. Fracture ulna on the upper end i.e. involving olecranon also disturb three point symmetry, but the radius has nothing to do with three point bony relationship and so it will not disturb three point bony symmetry. Ref: Apley's 8/e, Page 596-609.", 'role': 'assistant'}]