Max screen resolution and delete the ones that are higher?

Hi I have created a dropdown in my options menu with a function that changes the game window resolution. For now I have set 4 res. 1280p, 1366p, 1600p, and full hd. The question is if I have only a 1336p. screen res. (how can i find this information? Screen.currentResolution? that way can I find it? ) and how can I delete in this case the 2 voices in the dropdown that have a higher resolution than the max res. of the screen? Thanks

The Display class has the variables you need exposed.