[AS3] Resetting Radio buttons

Can anyone shed any light on resetting radio buttons? I have my buttons working in a quiz but want them to be reset when the user moves onto the next question. At moment the radio buttons are labeled A,B,C and D e.g multiple choice but when they go to the next question say ‘A’ was selected previously it still has ‘A’ selected. I have tried removing the addlisteners and removechild but this doesnt work any theories would be appreciated:puzzled: