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
[{'content': 'Sodium 2 mercapto ethane sulfonate is used as a protective agent is \nSelect and explain. \nA. Radiotherapy, B. Cancer chemotherapy, C. Lithotripsy, D. Hepatic encephalopathy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Refer KDT 6/e p833 Sodium 2 mercapto ethane sulfonic acid is used to amelioreae the hemorrhagic cystitis caused by cycloohosphamide and Ifosfamide', 'role': 'assistant'}]