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: \nSelect and explain. \nA. Hyperparathyroidism, B. Poliomyelitis, C. Marfan syndrome, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A, B, C, i.e. Hyperparathyroidism, Poliomyelitis, Marfan syndome', 'role': 'assistant'}]