<prompt> True about nephrogenic rest -a Associated with Wilms tumorb Increased risk of Wilms tumor in contralateral kidneyc No association with Wilms tumord Abnormal embryonal renal tissueacdbcdabdab  <response>: Nephrogenic restNephrogenic rest is afragment of embryonic tissue in the kidney retained after the period of embryonic development.Nephrogenic rests are putative precursor lesions of Wilms tumor and are seen in the renal parenchyma adjacent to approximately 40 of unilateral tumors; this frequently rises to nearly 100 in cases of bilateral Wilms tumor.The appearance of nephrogenic rests varies from expansile masses that resemble Wilms tumor hyperplastic rests to sclerotic rests consisting predominantly of fibrous tissue and occasional admixed immature tubules or glomeruli.It is important to document the presence of nephrogenic rests in the resected specimen, since these patients are at an increased risk of developing Wilms tumor in the contralateral kidney and require frequent and regular surveillance for many years 