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: Surgery
[{'content': 'An absolute contraindication for IVP is - \nSelect and explain. \nA. Allergy to the drug, B. Multiple myeloma, C. Blood urea > 200 mg, D. Renal tumor', 'role': 'user'}, {'content': 'Answer: A \nExplanation: • Although IVU gives excellent images of the urinary tract, its use should be restricted because in a few patients the iodine in the contrast medium may provoke a potentially life-threatening anaphylactic reaction.\n• Patients with a history of allergy, atopy and eczema are particularly vulnerable, but severe reactions may occur without warning.', 'role': 'assistant'}]