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': 'Among the following 5HT3 antagonist is ? \nSelect and explain. \nA. Cisapride, B. Ondansetron, C. Clozapine, D. Buspirone', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Ondansetron o Stimulation of 5-HT3 receptor is responsible for vomiting induced by anticancer drugs. 5-HT3 receptor antagonists (ondansetron, granisetron and tropisetron) are DOCs for chemotherapy induced vomiting.", 'role': 'assistant'}]