This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
[{'content': 'Investigation of choice in a person brought with traumatic paraplegia is: \nSelect and explain. \nA. MRI, B. CT, C. Myelography, D. USG', 'role': 'user'}, {'content': 'Answer: A \nExplanation: All spinal imaging is done by MRI\nMRI is safe in pregnancy Unit of MRI is TESLA.', 'role': 'assistant'}]