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
[{'content': 'Which one is non-ionising radiation - \nSelect and explain. \nA. MRI, B. CT Scan, C. X-ray, D. Position emission scintigraphy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans- A. MRI.', 'role': 'assistant'}]