Which agents contain no iodine according to the material?

• A. Magnevist and gadolinium
• B. Iodixanol and iohexol
• C. Barium sulfate
• D. Iodinated contrast agents

Answer: (A)

Iodine-free contrast media in this context are gadolinium-based agents, which are used for MRI. Gadopentetate dimeglumine (Magnevist) is one of these gadolinium-based agents, so it contains no iodine. In contrast, iodixanol and iohexol are iodinated contrast agents, meaning they contain iodine and are used mainly for CT and angiography, not MRI. The option referring to iodinated contrast agents clearly contains iodine, so it doesn’t fit. Barium sulfate also lacks iodine but is a GI tract contrast agent with a different use group than gadolinium-based MR contrast; the material highlighted iodine-free agents within the gadolinium-based MRI category, making Magnevist and gadolinium the best match.