<prompt> Which is a selective cyclo-oxygenase-2 inhibitor :KetorolacTolmetinNabumitoneOxaprozin  <response>: Ans. is c Nabumetone Ref: KDT 5th P180 page 464, 4,ue All the drugs mentioned are cyclo-oxygenase inhibitor both COX-1 COX-2 are inhibitedBut Nabumetone is a more potent COX-2 inhibitor than COX-1 a selective COX-2 inhibitorOther selective COX-2 inhibitors areCelecoxibRofecoxibThe risk for gastrointestinal bleeding is less with selective COX-2 inhibitors 