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': "Radiological sign of coarctation of aorta \nSelect and explain. \nA. Dock's sign, B. E - sign, C. Inverted 3 sign, D. All of the above", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Others :\xa0\n\nRevesed E sign.\nFigure of 3 sign.', 'role': 'assistant'}]