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
Most diagnostic of pulmonary embolism in a high-risk case is: 
Select and explain. 
A. Multidetector CT angiography, B. Catheter angiography, C. D-dimer, D. Ventilation perfusion scan
A: Multidetector CT angiography
Answer: A: Multidetector CT angiography 
Explanation: Ans. Multidetector CT angiography