This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
All the following are used in a patient with decreased renal function (reduced GFR) in order to avoid contrast nephropathy except 
Select and explain. 
A. N-acetyl cysteine, B. Mannitol, C. Fenoldopam, D. Low osmolar contrast media (LOCM)
B: Mannitol
Answer: B: Mannitol 
Explanation: .