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
[{'content': 'Treatment of choice for cyanide poisoning is: \nSelect and explain. \nA. NaHCO3, B. KMnO4, C. NaCI, D. Sodium nitrite followed by thiosulphate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]