user: Question: Who made the challenge in the Australian Grand Prix?
Columns: ['Rd.', 'Event', 'Circuit', 'City / State', 'Date', 'Championship', 'Challenge', 'Production']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Rd 1', 'Clipsal 500', 'Adelaide Street Circuit', 'Adelaide , South Australia', '19–22 March', 'Craig Baird', 'Klark Quinn', "Mark O'Connor"]
SQL:

assistant: SELECT "Challenge" FROM "Table" WHERE "Event" = 'Australian Grand Prix';