CREATE TABLE "table1_25531112_2" (
  "rd" text,
  "event" text,
  "circuit" text,
  "city_state" text,
  "date" text,
  "championship" text,
  "challenge" text,
  "production" text
);

Question: What circuit was the Clipsal 500 on?
SQL: SELECT "circuit" FROM "table1_25531112_2" WHERE "event"='Clipsal 500';

Question: Who made the challenge on the Albert Park Grand Prix Circuit?
SQL: SELECT "challenge" FROM "table1_25531112_2" WHERE "circuit"='Albert Park Grand Prix Circuit';

Question: In what round was the circuit Eastern Creek Raceway?
SQL: SELECT "rd" FROM "table1_25531112_2" WHERE "circuit"='Eastern Creek Raceway';

Question: Who made the challenge in the Australian Grand Prix?
SQL: SELECT "challenge" FROM "table1_25531112_2" WHERE "event"='Australian Grand Prix';