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': 'Excretory urography is contraindicated in: March 2011 \nSelect and explain. \nA. Renal aery hypeension, B. Single kidney, C. Multiple myeloma, D. Trauma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Multiple myeloma Contraindication to excretory/intravenous urography are 1) iodine sensitivity or previous reaction to contrast media, 2) pregnancy, 3) intractable cardiac or renal failure and 4) multiple myeloma', 'role': 'assistant'}]