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: Forensic Medicine
[{'content': 'Blistering war gas is: Maharashtra 09 \nSelect and explain. \nA. Chlorine gas, B. Mustard gas, C. HCN gas, D. Tabun', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Mustard gas', 'role': 'assistant'}]