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
An absolute contraindication for IVP is - 
Select and explain. 
A. Allergy to the drug, B. Multiple myeloma, C. Blood urea > 200 mg, D. Renal tumor
A: Allergy to the drug
Answer: A: Allergy to the drug 
Explanation: • 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.
• Patients with a history of allergy, atopy and eczema are particularly vulnerable, but severe reactions may occur without warning.