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 Anasthetic agent 
Select and explain. 
A. Ketamine, B. Thiopantone, C. Etomidate, D. Cyclopropane
D: Cyclopropane
Answer: D: Cyclopropane 
Explanation: D i.e. Cyclopropane