<prompt> Which of the following agents enhances the bioavailability of levodopa in patients with Parkinsons disease :AmantadineRopiniroleEntacaponeSelegiline  <response>: Levodopa metabolized in the body by two enzymes; MAO and COMT. Thus MAO inhibitors like selegiline and COMT inhibitors like entacapone and tolcapone can increase the bioavailability of dopa. 