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': 'Tegaserod is a \nSelect and explain. \nA. 5HT3 antagonist, B. D2 antagonist, C. 5HT4 agonist, D. NK1 antagonist', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cisapride, Mosapride, Prucalopride and Tegaserod are 5HT4 agonists used as prokinetics in constipation.\nTegaserod is withdrawn from market because of increased risk of myocardial infarction & stroke.', 'role': 'assistant'}]