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': 'Commonest dislocation of the hip is \nSelect and explain. \nA. Posterior, B. Anterior, C. Central, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Posterior', 'role': 'assistant'}]