<prompt> Aldose reductase inhibitor drugs are useful in?CataractDiabetes mellitusHereditary fructose intoleranceEssential fructosuria  <response>: Ans. is b i.e.. Diabetes mellitus o Aldose reductase catalyzes the NADPH-dependent conversion of glucose to sorbitol, the first step in polyol pathway of glucose metabolism.o Aldose reductase inhibitors are a class of drugs being studied as a way to prevent eye and nerve damage in people with diabetes mellitus.o Examples of aldose reductase inhibitors include:Tolrestat withdrawn from marketA pa l res tatRanirestatFidarestat 