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: Medicine
Gold standard for uagnosis of pulmonary embolism : 
Select and explain. 
A. Chest X-ray, B. Pulmonary angiography, C. Ventilation perfusion scintiscan, D. CT
B: Pulmonary angiography
Answer: B: Pulmonary angiography 
Explanation: None