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: Radiology
[{'content': "Inferior rib notching is seen in all except \nSelect and explain. \nA. Aortic thrombosis, B. Taussing Blalock operation, C. Pulmonary atresia, D. Marfan's syndrome", 'role': 'user'}, {'content': "Answer: D \nExplanation: Superior rib notching is seen in Marfan's syndrome.", 'role': 'assistant'}]