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
Among the following 5HT3 antagonist is ? 
Select and explain. 
A. Cisapride, B. Ondansetron, C. Clozapine, D. Buspirone
B: Ondansetron
Answer: B: Ondansetron 
Explanation: 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.