This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
Sodium 2 mercapto ethane sulfonate is used as a protective agent is 
Select and explain. 
A. Radiotherapy, B. Cancer chemotherapy, C. Lithotripsy, D. Hepatic encephalopathy
B: Cancer chemotherapy
Answer: B: Cancer chemotherapy 
Explanation: Refer KDT 6/e p833 Sodium 2 mercapto ethane sulfonic acid is used to amelioreae the hemorrhagic cystitis caused by cycloohosphamide and Ifosfamide