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': 'Lung sequestration occurs most commonly in which lobe - \nSelect and explain. \nA. Apical, B. Left posterior basal, C. Left posterosuperior, D. Right lateral basal', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]