user: Question: Which category has 5 stations?
Columns: ['City', 'System', 'Category', 'Daily ridership', 'As of', 'Opened', 'Stations']
Types: ['text', 'text', 'text', 'real', 'text', 'real', 'text']
Sample row: ['Vancouver, BC', 'SkyTrain (Vancouver)', 'ICTS', 354000.0, '2009', 1985.0, '47']
SQL:

assistant: SELECT "Category" FROM "Table" WHERE "Stations" = '5';