<prompt> Varenicline acts by ?Paial nicotine receptor agonistNicotine receptor antagonistBoth agonist and antagonist at nicotine receptorNone of the above  <response>: Ans. is a i.e., Paial nicotine receptor agonist Varenicline It is paial agonist at the nicotine receptor. It is used in nicotine addicts. 