<prompt> Which of the following agents is not used in the treatment of Diabetic Macular EdemaRetinopathy:RuboxistaurimPyridazinonesBenfotiamineTamoxifen  <response>: Ans. d TamoxifenRef: Yanoff 3e, p. 645Tamoxifen is known to cause retinopathy and macular edema as an adverse effect. It is not used in the treatment of Diabetic Macular edema or retinopathy. Ruboxistaurin - PKC inhibitor PyridazinonesSpiroimidescorbotyliz acid -- aldose reductase inhibitors Benfoliamine -levels of AGEs 