user: Question: What county has $51,456 income per capita?
Columns: ['County', 'Per capita income', 'Median household income', 'Median family income', 'Population', 'Number of households']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Nantucket', '$51,456', '$84,979', '$89,236', 10135.0, 3745.0]
SQL:

assistant: SELECT "County" FROM "Table" WHERE "Per capita income" = '$51,456';