user: Question: Who is the round winner of the Wanneroo Park circuit?
Columns: ['Rd.', 'Circuit', 'City / State', 'Date', 'Format', 'Round winner', 'Car', 'Entrant']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Symmons Plains', 'Launceston , Tasmania', '5 March', 'One race', 'Peter Brock', 'Holden LX Torana A9X', 'Marlboro Holden Dealer Team']
SQL:

assistant: SELECT "Round winner" FROM "Table" WHERE "Circuit" = 'Wanneroo Park';