CREATE TABLE table_23401 ("Rd." FLOAT, "Circuit" CLOB, "City / State" CLOB, "Date" CLOB, "Format" CLOB, "Round winner" CLOB, "Car" CLOB, "Entrant" CLOB)

Who is the round winner of the wanneroo park circuit?
SELECT "Round winner" FROM table_23401 WHERE "Circuit" = 'Wanneroo Park'
SELECT "Round winner" FROM "table_23401" WHERE "Circuit" = 'Wanneroo Park'