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': 'Shortening of limb is not seen in \nSelect and explain. \nA. Posterior dislocation of hip, B. Anterior dislocation of hip, C. Central dislocation of hip, D. TB Hip dislocation of hip', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]