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': 'I/V contrast is not used in - \nSelect and explain. \nA. CT scan, B. MRI, C. IVP, D. Myelography', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In myelography the contrast agent is injected into the subarachanoid space.', 'role': 'assistant'}]