<prompt> Essential pentosuria is due to defect inHMP pathwayGlycolysisGluconeogenesisUronic acid pathway  <response>: It is an inborn error of metabolism.In the pathway, L-xylulose is conveed to D-xylulose by two enzymes, xylitol dehydrogenase, and xylulose reductase.Absence of any of these enzymes leads to pentosuria.Ref: DM Vasudevan, 7th edition, page no: 135 