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': 'Superior rib notching is/are caused by – a) Hyperparathyroidismb) Poliomyelitisc) Blalock tausing shuntd) Marfan syndromee) Coarctation of aorta \nSelect and explain. \nA. acd, B. bcd, C. abc, D. abd', 'role': 'user'}, {'content': "Answer: D \nExplanation: Hyperparathyroidism, poliomyelitis and Marfan's syndrome cause notching of superior surface of rib.", 'role': 'assistant'}]