<prompt> Most impoant receptor involved in chemotherapy induced vomiting is:Histamine H1 receptorSerotonin 5-HT3 receptorDopamine D2 receptorOpioid m receptor  <response>: -5HT3 receptors are present in CTZ and are involved in chemotherapy induced vomiting. -Antagonist of this receptor like ondansetron is drug of choice for chemotherapy induced vomiting. 