Q: Which one of the following materials is strongly paramagnetic due to the presence of unpaired f-electrons and is widely used in MRI contrast agents?
(a)Lead
(b)Gadolinium
(c)Bismuth
(d)Platinum
Correct Answer: (c)
The correct answer is (c): Bismuth. Subject: International Relations | Sub-topic: United Nations Note: This answer was determined through AI-based research. Verify against the official answer key when available.