user: Question: In which county is the city/town of Halden located?
Columns: ['City/town', 'Municipality', 'County', 'City/town status', 'Population']
Types: ['text', 'text', 'text', 'real', 'real']
Sample row: ['Arendal', 'Arendal', 'Aust-Agder', 1723.0, 39826.0]
SQL:

assistant: SELECT "County" FROM "Table" WHERE "City/town" = 'Halden';