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: Pharmacology
Treatment of choice for cyanide poisoning is: 
Select and explain. 
A. NaHCO3, B. KMnO4, C. NaCI, D. Sodium nitrite followed by thiosulphate
D: Sodium nitrite followed by thiosulphate
Answer: D: Sodium nitrite followed by thiosulphate 
Explanation: None