Ah, almost forgot.
Regarding how to answer these questions: I simply called the schools' registrar's department.
Although I don't recall which schools had which answers, some said "the university requires it for demographic records but it won't affect admission", some applications did have the "Other" field to specify, one school's application did have in small print that it was important to get students of all races or something like that (I want to say that was Yale but I could be TOTALLY mistaken on that one), and some applications had enough options to where it wasn't an issue.
So, basically. I just asked and answered as best I could.