This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Magnetic Resonance Imaging, Subject name: Radiology
[{'content': 'Gyromagnetic propey of Hydrogen nucleus is used in \nSelect and explain. \nA. USG, B. PET, C. CT, D. MRI', 'role': 'user'}, {'content': 'Answer: D \nExplanation: MRI is based on Gyromagnetic propey of H+ ions, Protons. ULTRASOUND is based on Pulse echo principle and Piezoelectric effect. CT SCAN is based on Linear attenuation of X rays.', 'role': 'assistant'}]