This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Histamine, 5-HT and PGs, Subject name: Pharmacology
[{'content': 'Most impoant receptor involved in chemotherapy induced vomiting is: \nSelect and explain. \nA. Histamine H1 receptor, B. Serotonin 5-HT3 receptor, C. Dopamine D2 receptor, D. Opioid m receptor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: -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.', 'role': 'assistant'}]