This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pharmacology
[{'content': 'Ondansetron acts by inhibiting which of the following receptors? \nSelect and explain. \nA. 5-HT1, B. 5-HT2, C. 5-HT3, D. 5-HT4', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ondasetron blocks the depolarising action of 5HT exeed through 5HT3 receptor on on vagal afferents in the git as well as in NTZ and CTZ ESSENTIALS OF MEDICAL PHARMACOLOGY SEVENTH EDITION KD TRIPATHI PG NO.668', 'role': 'assistant'}]