This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pharmacology
[{'content': 'Drug used in cancer chemotherapy induced vomiting is? \nSelect and explain. \nA. Aprepitant, B. Dexamethasone, C. Ondansetrin, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ondansetron is drug of choice for chemotherapy induced vomiting Dexamethasone,lorazepam and aprepitant are also used for chemotharapy induced vomiting.( ref KDT 7/e p876)', 'role': 'assistant'}]