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': 'All of the following are true about iodinated intravascular contrast media except – \nSelect and explain. \nA. They are used in digital subtraction angiography, B. They are radio opaque, C. They can cause anaphylactic reactions, D. They are used in magnetic resonance imaging', 'role': 'user'}, {'content': 'Answer: D \nExplanation: MRI functions through different principles and thus utilizes different contrast agents. Gadolinium is the most commonly used contrast in MRI.\nBoth gadolinium-based and iodinated contrast media are used for digital subtraction angiography.\nRadiocontrast agents are radiopaque.\nRadiocontrast agents are excreted by the kidney.\nRadiocontrast agents can cause anaphylactoid reaction and nephropathy.', 'role': 'assistant'}]