user: Question: Which category Won the Sundance Film Festival award in 1998?
Columns: ['Year', 'Award', 'Category', 'Film or series', 'Result']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1998.0, 'Gotham Awards', 'Best Actress', 'Slam', 'Won']
SQL:

assistant: SELECT "Category" FROM "Table" WHERE "Result" = 'Won' AND "Year" = 1998.0 AND "Award" = 'Sundance Film Festival';