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': 'Thompson and Epstein classification used in \nSelect and explain. \nA. Anterior dislocation of Hip, B. Posterior dislocation of Hip, C. Central dislocation of Hip, D. Fracture neck of femur', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]