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: Pharmacology
Toxicity of nitrogen mustards can be decreased by : 
Select and explain. 
A. Amifostine, B. Folinic acid, C. GM–CSF, D. MESNA
C: GM–CSF
Answer: C: GM–CSF 
Explanation: None