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': 'The most serious complication of a pelvic fracture is: \nSelect and explain. \nA. Rupture urinary bladder, B. Neurogenic shock, C. Hypovolemic shock, D. Malunion', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]