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': "Not a Radiological finding of pericardial effusion \nSelect and explain. \nA. Cardiomegaly, B. Oreo cookie sign, C. Water bottle or flask shaped heart, D. Dock's sign", 'role': 'user'}, {'content': "Answer: D \nExplanation: Dock's sign (inferior notching of 3-8 ribs).\nSeen in\xa0coarctation of aorta.", 'role': 'assistant'}]