<prompt> Mechanism of action of Dabigtran -Activation of plasminDirect inhibition of thrombinIndirect inhibition of thrombimInactivation of vitamin K dependent facters  <response>: Ans. is 4b i.e., Direct inhibition of thrombin AnticoagulantsOrali Vitamin K inhibitors Traditional oral anticoagulants:- Warfarin, dicumarol, acenocoumarol, ethylbiscoumacetate, phenindione.ii Facto Xa inhibitors:- Rivaroxaban, Apixaban.iii Direct thrombin inhibitors:- Ximelaeatran. dabiyatran.Parentrali Indirect thrombin inhibitors:- Unfractionated heparin, low molecular weight heparin e.g. Enoxaparin, reviparin etc, Fondaparinux, Idraparinux.ii Direct thrombin inhibitors:- Hirudin, Lepirudin, bivalirudin, argatroban, melagatron, ximelagatron. 