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: Pharmacology
[{'content': 'All of the following are effective against cytotoxic drug induced emesis except - \nSelect and explain. \nA. Dexamethasone, B. Hyoscine, C. Metoclopramide, D. Ondansetron', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Hyoscine", 'role': 'assistant'}]