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
[{'content': 'Most potent antiemetic agent used in preoperative period – \nSelect and explain. \nA. Glycopyrolate, B. Hyoscine, C. Atropine, D. Metochlorpromide', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Commonly used antiemetics in pre-operative period are Hyoscine, Ondansetron, Perinorm.\n\nAmongst this Hyoscine is most potent :-\n"Hyoscine is the most potent antiemetic to be used as part of premedication".\xa0\xa0\xa0\xa0\xa0\xa0\n— Fundamental of anaesthesia', 'role': 'assistant'}]