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: Forensic Medicine
[{'content': 'Prolonged administration of Sodium nitroprussside can cause poisoning of: \nSelect and explain. \nA. Cyanide, B. Methanol, C. Arsenic, D. Phenol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cyanide', 'role': 'assistant'}]