This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fundamentals in Radiology, Subject name: Radiology
[{'content': 'Gyromagnetic propey of proton is seen in - \nSelect and explain. \nA. MRI, B. CT, C. PET scan, D. USG', 'role': 'user'}, {'content': 'Answer: A \nExplanation: MRI is based on gyromagnetic propey on protons. Defined as the ability of protons in the body to absorb and emit radio waves, when the body is placed in strong magnetic field.', 'role': 'assistant'}]