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 an intravenous anaesthetic 
Select and explain. 
A. Etomidate, B. Thiopentone, C. Ketamine, D. Cyclopropane
D: Cyclopropane
Answer: D: Cyclopropane 
Explanation: Ans. is 'd' i.e., Cyclopropane