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
Hampton's hump is seen in chest X-ray in: 
Select and explain. 
A. Bronchogenic Ca, B. Aspergillosis, C. Pulmonary TB, D. Pulmonary embolism
D: Pulmonary embolism
Answer: D: Pulmonary embolism 
Explanation: pulmonary embolism Hamptons' hump is one of the classic radiographic findings of pulmonary embolism. It appears as a peripheral wedge shaped opacity on chest x rays. It is d/t pulmonary infarct. Other signs of pulmonary embolism on chest x-ray Westermark's sign - it's a.focal area of oligetnia due to vesoconstriction distal to embolus. Palla's sign - enlarged right descending pulmonary aery.