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: Radiology
Contrast media of choice for myelogram is – 
Select and explain. 
A. Urografin 75%, B. Conray 470, C. Iohexol, D. Biligrafin
C: Iohexol
Answer: C: Iohexol 
Explanation: "As iohexol and iopamidol, are associated with significantly fewer side effects than metrizamide and are the current contrast agents of choice".