<prompt> A malignant tumor of childhood that frequently metastasizes to bone marrow most often is:Wilms tumorNeuroblastomaAdrenal gland tumorsGranulosa cell tumor of ovary  <response>: b. NeuroblastomaRef: Indian J Hematol Blood Transfus. 2011 ;272:93-95The malignancies of prostate, breast, lungs, kidney thyroid in adults and neuroblastoma and rhabdomyosarcoma in children are the primary tumors which frequently involve bone marrow. 