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
Contrast used for MRI : 
Select and explain. 
A. Iodine, B. Gadolinium, C. Metvazamide, D. Omnipaque
B: Gadolinium
Answer: B: Gadolinium 
Explanation: B i.e. Gadolinium