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: Anaesthesia
Sodium nitroprusside infusion may result in – 
Select and explain. 
A. Hypertension, B. Pulmonary oedema, C. Cyanide toxicity, D. Heart block
C: Cyanide toxicity
Answer: C: Cyanide toxicity 
Explanation: Sodium nitropruside has five cyanide groups with in its structure and Cyanide toxicity is a problem if it is used is in high doses.