CREATE TABLE table_8791 ("Margin" FLOAT, "Score" TEXT, "Winning Team" TEXT, "Losing Team" TEXT, "Venue" TEXT, "Date" TEXT)

What is the Winning Team, when Losing Team is South Sydney Rabbitohs?
SELECT "Winning Team" FROM table_8791 WHERE "Losing Team" = 'south sydney rabbitohs'
SELECT "Winning Team" FROM "table_8791" WHERE "Losing Team" = 'south sydney rabbitohs'