Table:
text: 1989 Australian Drivers' Championship
Race calendar
Race calendar
Circuit City_State Date_ Winner Team
Mallala Motor Sport Park Mallala , South Australia 7 May Mark McLaughlin Elfin Sports Cars
Mallala Motor Sport Park Mallala , South Australia 7 May Rohan Onslow R.J.Macarthur Onslow
Winton Motor Raceway Benalla , Victoria 4 June Rohan Onslow R.J.Macarthur Onslow
Winton Motor Raceway Benalla , Victoria 4 June John Briggs John Briggs
Oran Park Raceway Sydney , New South Wales 4 August Rohan Onslow R.J.Macarthur Onslow
Oran Park Raceway Sydney , New South Wales 4 August Rohan Onslow R.J.Macarthur Onslow
Amaroo Park Sydney , New South Wales 20 August Neil Crompton Boylan Racing

Question: What is the 1989 Australian City/State Drivers' Championship if the winner is Rohan Onslow and if the racetrack is Oran Park Raceway?

Question: What is winner if City/State is "Mallala, South Australia" and when team is "Elfin Sports Cars" for the 1989 Australian Drivers' Championship?

Question: What is winner if the team is "RJMacArthur Onslow" and the circuit is "Oran Park Raceway" for the 1989 Australian Drivers' Championship?

Question: What is the 1989 Australian Drivers Championship date if city/state is "Mallala, South Australia" and if team is "RJMacArthur Onslow"?