This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Radiology
Best investigation for pulmonary embolism ___: 
Select and explain. 
A. MRI, B. V/Q scan, C. Plain CT, D. CT angiography
D: CT angiography
Answer: D: CT angiography 
Explanation: Ans. D. CT angiographyPulmonary CT angiography /MDCT is the best investigation for pulmonary embolism. The dye is injected through the intravenous route.* V/Q scan is done in pregnant females.* Investigation of choice for an aortic aneurysm is CT angiography.