Paramagnetic and Diamagnetic Elements | MCAT Practice Question

Magnetic resonance imaging (MRI) often uses intravenous contrast agents to enhance the visibility of blood vessels. To effectively create contrast against background tissue, these agents must be paramagnetic. Which of the following elements would be most suitable as an MRI contrast agent for evaluating vascular flow?
a) Magnesium
b) Beryllium
c) Neon
d) Gadolinium
e) Argon

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