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': 'Kocher Langenbeck approach for emergency acetabular fixation is done in all Except: \nSelect and explain. \nA. Open fracture, B. Progressive sciatic nerve injury, C. Recurrent dislocation inspite of closed reduction and traction, D. Morel-Lavallee lesion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D. i.e. Morel Lavalle lesion', 'role': 'assistant'}]