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
[{'content': 'Which following are postulated mechanism by which propofol acts as antiemetic:- \nSelect and explain. \nA. Antidopaminergic activity, B. Depressant effect on the chemoreceptor trigger zone, C. Decreased release of glutamate and aspect able in the olfactory coex and decreased serotonin, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: causes of antiemetic effect of propofol Antidopaminergic activity Depressant effect on the chemoreceptor trigger zone Decreased release of glutamate and aspect able in the olfactory coex and decreased serotonin', 'role': 'assistant'}]