user: Question: During what conference is North Carolina listed as the tournament winner?
Columns: ['Conference', 'Regular Season Winner', 'Conference Player of the Year', 'Conference Tournament', 'Tournament Venue (City)', 'Tournament Winner']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Atlantic Coast Conference', 'North Carolina', 'Lennie Rosenbluth , North Carolina', "1957 ACC Men's Basketball Tournament", 'Reynolds Coliseum ( Raleigh, North Carolina )', 'North Carolina']
SQL:

assistant: SELECT "Conference" FROM "Table" WHERE "Tournament Winner" = 'North Carolina';