For Race, I always say that I don't know. Because, honestly, I do not know the racial origins of my great-grandparents. I don't even know their names! I could well be African American, or any other race, and not know it.
I figured that up one time, and think I determined I am 1/16 Choctaw Indian. I think I should get money from the government since they took my land away and stuck my ancestors on a reservation.
Maybe on the next census form, I'll put I am American Indian, that should upset them.