This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ultrasonography, CT, and MRI, Subject name: Radiology
Gyromagnetic property of proton is seen in - 
Select and explain. 
A. MRI, B. CT, C. PET scan, D. USG
A: MRI
Answer: A: MRI 
Explanation: Ans. is 'a' i.e., MRI o Ultrasonography is based on piezoelectric effect.o MRI is based on gyeromagnetic property of proton (H+)