user: Question: Who won the South African Grand Prix?
Columns: ['Race', 'Date', 'Location', 'Pole Position', 'Fastest Lap', 'Race Winner', 'Constructor', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Argentine Grand Prix', '21 January', 'Buenos Aires', 'Jacques Laffite', 'Jacques Laffite', 'Jacques Laffite', 'Ligier - Ford', 'Report']
SQL:

assistant: SELECT "Race Winner" FROM "Table" WHERE "Race" = 'South African Grand Prix';