This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
[{'content': 'Nerve gases include all, except \nSelect and explain. \nA. Tabun, B. Bromo Benzyl Cyanide (BBC), C. Sarin, D. Soman', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Tabun, Sarin, Soman, Cyclosarin are some examples of the nerve agents. Bromo Benzyl Cyanide is a tear gas. Ref - Krishnan Vij 5th edition pg 554-556', 'role': 'assistant'}]