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
[{'content': 'Contrast media of choice for myelogram is – \nSelect and explain. \nA. Urografin 75%, B. Conray 470, C. Iohexol, D. Biligrafin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: "As iohexol and iopamidol, are associated with significantly fewer side effects than metrizamide and are the\xa0current contrast agents of choice".', 'role': 'assistant'}]