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
[{'content': 'All of the following are true about Ondansetron except? \nSelect and explain. \nA. Drug of choice for chemotherapy induced vomiting, B. Dopamine antagonist, C. 5HT3 antagonist, D. Acts on CTZ', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Dopamine antagonist Ondansetron is 5-HT3 receptor antagonist at CTZ and NTS, as well as in GIT.", 'role': 'assistant'}]