user: Question: Who were the GT winning team when the GTC winning team was No. 54 Black Swan Racing?
Columns: ['Season', 'LMP1 Winning Team', 'LMP2 Winning Driver', 'LMPC Winning Team', 'GT Winning Team', 'GTC Winning Team', 'Results']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [2011.0, 'No. 20 Oryx Dyson Racing', 'Did Not Participate', 'No. 37 Intersport Racing', 'No. 17 Team Falken Tire', 'No. 54 Black Swan Racing', 'Results']
SQL:

assistant: SELECT "GT Winning Team" FROM "Table" WHERE "GTC Winning Team" = 'No. 54 Black Swan Racing';