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
Nerve gas is: TN 10 
Select and explain. 
A. Methyl isocyanate, B. Phosgene, C. Diphenylchloroarsine, D. Sarin
D: Sarin
Answer: D: Sarin 
Explanation: Ans. Sarin