user: Question: Who was the winner on the Amaroo Park circuit?
Columns: ['Race Title', 'Circuit', 'City / State', 'Date', 'Winner', 'Team']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Better Brakes 100', 'Amaroo Park', 'Sydney , New South Wales', '1 - 2 Mar', 'Robbie Francevic', 'Volvo Dealer Team']
SQL:

assistant: SELECT "Winner" FROM "Table" WHERE "Circuit" = 'Amaroo Park';