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': 'Bronchogenic sequestration is seen in which lobe - \nSelect and explain. \nA. Left lower lobe, B. Right upper lobe, C. Left middle lobe, D. Left upper lobe', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bronchogenic sequestration refers to the presence of a discrete mass of lung tissue without any normal connection to the airway system.\nIntralobar sequestrations are found most frequently in the posterior basal segment of the left lower lobe.\nBlood supply to the sequestered area arises not from the pulmonary arteries but from the aorta or its branches.\nExtralobar sequestrations are external to the lung. Found most commonly in infants as abnormal mass lesions, they may be associated with other congenital anomalies.\nIntralobar sequestrations are found within the lung substance and are usually associated with recurrent localized infection or bronchiectasis.', 'role': 'assistant'}]