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': 'Straddle fracture is \nSelect and explain. \nA. Shoulder fracture, B. Wrist fracture, C. Pelvis fracture, D. Ankle fracture', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]