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 in spite of closed reduction and traction, D. Open irrigation and debridement of the hip joint', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Indications for Kocher Langenbeck approach: 1. Open reduction and internal fixation of acetabular fractures Posterior wall Posterior column Transverse posterior wall Posterior column-posterior wall T-type Transverse 2. Open irrigation and debridement of the hip joint 3. Recurrent dislocation in spite of closed reduction and traction Ref: Relevant surgical exposures edited by Bernard F. Morrey, M.D., Matthew C. Morrey, 2008, Page 134.', 'role': 'assistant'}]