<prompt> Tolterodine used in overactive bladder acts by blocking which of the following receptors?M1M2M3M4  <response>: Selective M3 antagonists acting on GIT and bladder Selective M3 antagonists acting only on bladder vesicoselective Derifenacin Oxybutynin Solifenacin Flavoxate Tolterodine Trospium chloride 