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': "Which of the following radiological sign will be present in a young lady with symptoms suggestive of pulmonary embolism? \nSelect and explain. \nA. Hampton's hump, B. Westermark sign, C. Fleischner sign, D. All of the above", 'role': 'user'}, {'content': "Answer: D \nExplanation: Pulmonary infarction may occur if the pulmonary venous pressure is elevated or the bronchial aerial supply to a region is deficient. The cone-shaped area of pulmonary infarction has been called a Hampton's hump. An area of radiolucency, corresponding to diminished pulmonary vascularity distal to a pulmonary embolism, is occasionally seen and is called the Westermark sign. There may also be an increase in the size of the pulmonary aery proximal to a large central pulmonary embolus (Fleischner sign). Ref: Chiles C., Gulla S.M. (2011). Chapter 4. Radiology of the Chest. In M.Y. Chen, T.L. Pope, D.J. Ott (Eds), Basic Radiology, 2e.", 'role': 'assistant'}]