Random in group of object

Hi, I’m working on an endless up runeer for my schoolchild.

Is it possible to choose randomly an object between two groups of object (the good answer and the false)

I have this.

I made platform on the left/right/center and on this platform, there is an add (here 6+4) but I want to do it randomly.

When I do Create object “Goodanswer” at position.
I have only the first add of the group.

Is it possible and how can I do please?