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: Pathology
[{'content': 'Most common lung malfomation - \nSelect and explain. \nA. Hypoplasia of lung, B. Congenital cyst, C. Vascular anamolies, D. Lobar sequestration', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]