Read this and answer the question. If the question is unanswerable, say "unanswerable".

Although used in the Census and the American Community Survey, "Some other race" is not an official race, and the Bureau considered eliminating it prior to the 2000 Census. As the 2010 census form did not contain the question titled "Ancestry" found in prior censuses, there were campaigns to get non-Hispanic West Indian Americans, Turkish Americans, Armenian Americans, Arab Americans and Iranian Americans to indicate their ethnic or national background through the race question, specifically the "Some other race" category.

In addition to the Census, where else is the "some other race" selection an option?
the American Community Survey