<prompt> Which of the following tumours is radiosensitive?Ewings sarcomaMalignant melanomaHepatocellular carcinomaOsteosarcoma  <response>: Ans: a Ewings sarcomaEwings sarcoma is a highly radiosensitive tumourRadio sensitive tumoursRadio resistant tumours Seminoma Osteosarcoma Lymphoma Melanoma Myeloma Pancreatic carcinoma Ewings sarcoma Hepatoma Wilms tumour 