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': 'Mechanism of action of sodium nitroprusside in cyanide poisoning - \nSelect and explain. \nA. Produces methemoglobinemia, B. Increased blood flow to liver, C. Increased blood flow to hea, D. Increased blood flow to kidney', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Produces methemoglobinemia o Nitrates generate methaemoglobin which has high affinity for cyanide and forms cyanomethaemoglobin.o Cynomethaemoglobin may again dissociate to release cyanide, therefore, sodium thiosulfate is given to form sod.", 'role': 'assistant'}]