<prompt> Which of the following is the longest acting oral anticoagulant ?BishydroxycoumarinWarfarinAcenocoumarolPhenindione  <response>: Ans. is a i.e., Bishydroxycoumarin Bishydroxycoumarin Dicumarol is the longest acting oral anticoagulant. Ethylbiscoumacetate is the shoest acting anticoagulant. 