<prompt> Which of the following drugs is not an antiemetic?OndansetronDomperidoneMetoclopramideCinnarizine  <response>: Ans. D CinnarizineRef: KDT, 18the p712Cinnarizine is an anti-vertigo drug.Metoclopramide and domperidone are antiemetic drugs. These act by blocking D2 receptors.Ondansetron is an antagonist of 5HT3 receptors. It is the drug of choice for chemotherapy induced vomiting. 