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 aortic dissection in unstable patient \nSelect and explain. \nA. CT scan, B. MRI, C. TEE, D. PET', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Stable patient - MRI.\nUnstable patient - TEE (Trans esophageal\xa0Echo).', 'role': 'assistant'}]