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

The New York Public Library, which has the largest collection of any public library system in the United States, serves Manhattan, the Bronx, and Staten Island. Queens is served by the Queens Borough Public Library, the nation's second largest public library system, while the Brooklyn Public Library serves Brooklyn.

Along with Staten Island and the Bronx, what borough is served by the New York Public Library?
Manhattan