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
Not intravenous Anaesthetic agent – 
Select and explain. 
A. Ketamine, B. Thiopentone, C. Etomidate, D. Cyclopropane
D: Cyclopropane
Answer: D: Cyclopropane 
Explanation: Ketamine, thiopentone, etomidate are intravenous anaesthetic agents. Cyclopropane is an inhalational (volatile) anaesthetic agent.