<prompt> Which of these tumors is least radiosensitiveEwings sarcomaOsteosarcomaWilms tumorNeuroblastoma  <response>: Ans. is b i.e. Osteosarcoma Repeated innumerable timesOsteosarcoma is least radiosensitive out of the four.Radiosensitivity of differenttumors AHighly Sensitive CRelatively resistant LymphomaSeminomaMyelomaEwings Sq cell Ca of lung Hypernephroma Rectal Carcinoma Bladder carcinomaBWilms tumor Moderately sensitiveSmall cell Ca of lung Breast cancer Basal cell Ca DSoft tissue sarcoma Carcinoma of the cervix Highly resistant Melanoma Osteosarcoma Pancreatic Medulloblastoma TeratomaOvarian cancer About neuroblastoma, Devitas Oncology, 7e, p 1907 writes - Neuroblastoma is very sensitive to ionizing radiation. 