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': 'Most common nerve injured in posterior dislocation of hip \nSelect and explain. \nA. Sciatic, B. Femoral, C. Superior glutcal nerve, D. Inferior glutcal nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]