Answer must be egg, because a 'protochicken', or the generation before the chicken laid the egg, and the current chicken hatched from it, and went though various mutations to reach what we call the common chicken.
@Candunc(View Post) I've always thought that one myself. The evolutionary stage before a chicken must've layed the egg, which was a chicken egg, once hatched. (also, haven't seen you in a long time - since June O_O)
I guess that's quite true but if dinosaurus didn't exist then the chicken would come first since an egg can't be hatched whitout the chicken hatching it?