I have developed a word document that contains several pulldown menus created using the UI Content Control Boxes. I would like the font color be based on the item selected from the pulldown menu. How can this be done?

example:
Select the gauge reading:
50
10
0
if 50 is selected, font color is green
if 10 is selected, font color is yellow
if 0 is selected, font color is red

Thanks!