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': 'A patient is to undergo angiography for unstable angina. His routine evaluation revealed his serum creatinine to be elevated. All of the following can be used to prevent contrast nephropathy, EXCEPT: \nSelect and explain. \nA. Haemofiltration, B. Fenoldopam, C. N-acetylcysteine, D. 1/2 N saline', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Strategies for the Prevention of Contrast-Induced Nephropathy: Strategies that do not work: Mannitol Furosemide Dopamine Atrial natriuretic factor Fenoldopam Hemodialysis Strategies that may work: Calcium channel blockers Theophylline N-Acetylcysteine Hemofiltration Sodium bicarbonate Ascorbic acid Iso-osmolar contrast media Current recommended strategies: Employ non iodinated contrast studies Avoid nonsteroidal anti-inflammatory agents Space between contrast administrations Minimize contrast volume Hydration Low osmolar contrast media Ref: Brunelli S., Rudnick M.R. (2009). Chapter 12. Contrast-Induced Nephropathy. In E.V. Lerma, J.S. Berns, A.R. Nissenson (Eds), CURRENT Diagnosis & Treatment: Nephrology & Hypeension.', 'role': 'assistant'}]