This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Radiology
[{'content': 'For pericardial calcifications, which is the best investigation - \nSelect and explain. \nA. MRI, B. Transesophageal echocardiography, C. USG, D. CT scan', 'role': 'user'}, {'content': 'Answer: D \nExplanation: CT is the most accurate method of demonstrating the extent and distribution of pericardial calcification. Ref : Suttons Radiology', 'role': 'assistant'}]