This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Forensic Toxicology - Concepts, Statutes, Evidence, and Techniques, Subject name: Forensic Medicine
A my I nitrite is u sed as antidote in which poisoning- 
Select and explain. 
A. Cyanide, B. Cholinesterase, C. Benzodiazepine, D. Barbiturate
A: Cyanide
Answer: A: Cyanide 
Explanation: Ans. is 'a' i.e., Cyanide PoisonAntidotesAcetominaphen (paracetamol)N-Acetyl cysteineNitrites, cyanidesAmyl nitrite + sodium nitrite + sodium thiosulphateOrganophosphates (antichol inesterase)Atropine and oximesDigoxinDizibind or digoxin immune FabEthylene glycol, methanol, ethanolFomipizoleHeroin (opioids)Naloxone or nalmefene or naltrexoneBenzodiazepineFlumazenilDhatura / atropine i antihistaminicsPhysostigmineActue iron poisoningDeferoxamineAcute arsenic poisoningDimercaprol / B ALOxalic acidCalcium gluconateStrychinineShort acting barbituratesNote: Cooper sulphate is a poison itself, but it is used as an antidote in phosphorus poisoning.