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': 'Nerve gas is: TN 10 \nSelect and explain. \nA. Methyl isocyanate, B. Phosgene, C. Diphenylchloroarsine, D. Sarin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Sarin', 'role': 'assistant'}]