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
All of the following are true about iodinated intravascular contrast media except – 
Select and explain. 
A. 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
D: They are used in magnetic resonance imaging
Answer: D: They are used in magnetic resonance imaging 
Explanation: MRI functions through different principles and thus utilizes different contrast agents. Gadolinium is the most commonly used contrast in MRI.
Both gadolinium-based and iodinated contrast media are used for digital subtraction angiography.
Radiocontrast agents are radiopaque.
Radiocontrast agents are excreted by the kidney.
Radiocontrast agents can cause anaphylactoid reaction and nephropathy.