<prompt> Mechanism of action of cisapride?Inhibition of D2 receptorsAntagonism of 5HT3 receptorsAntagonism of 5HT4 receptorsAgonism of 5HT4 receptors  <response>: Cisapride, mosapride, and renzapride are prokinetic agents acting by 5HT4 agonismRef: HL Sharma 3rd ed.Pg 355. 