<prompt> Antipseudomonals are all, except.CephalexinCarbenicillinPiperacillinCeftazidime  <response>: Ans. A CephalexinRef: KDT 8e p773,774,776; Goodman Gilman 10e p1209Cephalexin is an orally effective first generation cephalosporin active against gram positive but not against gram negative organisms like pseudomonas. 