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': 'Most reliable method of diagnosing pulmonary embolism is: September 2004 \nSelect and explain. \nA. Plain skiagram, B. Perfusion, C. Electrocardiography, D. Angiography', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D i.e. Angiography Pulmonary angiography has been now replaced by CT and MR angiography', 'role': 'assistant'}]