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
Maximum emesis causing anaesthetic – 
Select and explain. 
A. N2O, B. Diethyl ether, C. Chloroform, D. Thiopental
B: Diethyl ether
Answer: B: Diethyl ether 
Explanation: Ether is one of the most emetogenic of all the inhalational agents → High incidence of post-operative nausea & vomiting.