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
I/V contrast is not used in - 
Select and explain. 
A. CT scan, B. MRI, C. IVP, D. Myelography
D: Myelography
Answer: D: Myelography 
Explanation: In myelography the contrast agent is injected into the subarachanoid space.