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': 'Commonest dislocation of elbow- \nSelect and explain. \nA. Anterior, B. Posterior, C. Both same, D. Medial', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The elbow dislocation is nearly always posterior or posterolateral.', 'role': 'assistant'}]