This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System, Subject name: Radiology
[{'content': 'Sequestrated lung is most commonly supplied by: \nSelect and explain. \nA. Bronchial artery, B. Subclavian artery, C. Pulmonary artery, D. Ascending aorta', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. d (Ascending aorta). (Ref. Sutton Radiology 7th ed. 253)Pulmonary sequestration# Sequestrated lung is "a congenital mass of aberrant pulmonary tissue that has no normal connection with the bronchial tree or with the pulmonary arteries, and usually supplied separately by a anomalous branch from ascending aorta directly.# It is usually located in one of the basal segments of lower lobe. In 98% cases intralobar sequestration involves medial parts of left lower lobe. 98% of extralobar sequestrations are left sided.# Two varieties of pulmonary sequestration are known:A. Extralobar: it is most common variety in neonates and infants, is located between the lower lobe and diaphragm, has its own pleural covering, and other anomalies are common (65%), (like pulmonary hypoplasia, horseshoe lung, CCAM, bronchogenic cysts, diaphragmatic hernia and cardiac anomalies).B. Intralobar sequestration: diagnosed after adolescence, contained within lung with no separate pleural covering, and is intimately connected to adjacent lung.', 'role': 'assistant'}]