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
Prolong administration of Sodium nitroprusside can cause which poisoning? 
Select and explain. 
A. Cyanide, B. Methanol, C. Arsenic, D. Phenol
A: Cyanide
Answer: A: Cyanide 
Explanation: ANSWER: (A) CyanideREF: Cardiac anesthesia: principles and clinical practice Lippincott 2nd edition - Page 91Cyanide poisoning can occur in rapid or excessive administration of sodium nitroprusside. Guidelines for safe administration of sodium nitroprusside has been established to prevent the risk of cyanide toxicityMaximum dose of sodium nitroprusside:Maximum acute doseMaximum chronic dose1.5 mg/kg for 1-3 hours0.5 mg/kg/hr