This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Pharmacology
Which of the following drug is an antidote for cyanide poisoning? 
Select and explain. 
A. Amyl nitrate, B. Isosorbide dinitrate, C. Nitroglycerine, D. Propranolol
A: Amyl nitrate
Answer: A: Amyl nitrate 
Explanation: Ans. A. Amyl nitrateAmyl nitrite is one of antidote of cyanide poisoning. It is given via inhalational route. Hydroxocobalamin is also given for cyanide poisoning via intravenous route.