This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autacoids, Subject name: Pharmacology
[{'content': 'Mechanism of action of cisapride? \nSelect and explain. \nA. Inhibition of D2 receptors, B. Antagonism of 5HT3 receptors, C. Antagonism of 5HT4 receptors, D. Agonism of 5HT4 receptors', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cisapride, mosapride, and renzapride are prokinetic agents acting by 5HT4 agonismRef: HL Sharma 3rd ed.Pg 355.', 'role': 'assistant'}]