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': 'IOC for cardiac tamponede \nSelect and explain. \nA. 2D - Echo, B. USG, C. CT, D. MRI', 'role': 'user'}, {'content': 'Answer: A \nExplanation: IOC for cardiac tamponade - 2D Echo.\nIOC for cardiomyopathy\xa0 - 2D Echo.', 'role': 'assistant'}]