<prompt> Among the following 5HT3 antagonist is ?CisaprideOndansetronClozapineBuspirone  <response>: 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. 