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
Drug used in cancer chemotherapy induced vomiting is? 
Select and explain. 
A. Aprepitant, B. Dexamethasone, C. Ondansetrin, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: 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)