This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intravenous Anesthetic Agents, Subject name: Anaesthesia
Postoperative nausea and vomiting are uncommon with 
Select and explain. 
A. Thiopentone, B. Propofol, C. Etomidate, D. All the above
B: Propofol
Answer: B: Propofol 
Explanation: Propofol is antiemetic. Antiemetic effect - The postulated mechanisms include antidopaminergic activity, depressant effect on the chemoreceptor trigger zone and vagal nuclei, decreased release of glutamate and aspaate in the olfacto0ry coex and reduction of serotonin concentration in area postrema.