CREATE TABLE table_27744 ("Rd." CLOB, "Event" CLOB, "Circuit" CLOB, "City / State" CLOB, "Date" CLOB, "Championship" CLOB, "Challenge" CLOB, "Production" CLOB)

Who made the challenge in the Australian Grand Prix?
SELECT "Challenge" FROM table_27744 WHERE "Event" = 'Australian Grand Prix'
SELECT "Challenge" FROM "table_27744" WHERE "Event" = 'Australian Grand Prix'