Question: The 2016 City of Onkaparinga ATP Challenger took place in a metropolitan suburb how far south of the Central Business District of Adelaide?
{'answer': '20 km', 'supporting_facts': [['2016 City of Onkaparinga ATP Challenger', 0], ['2016 City of Onkaparinga ATP Challenger', 2], ['Happy Valley, South Australia', 0], ['Happy Valley, South Australia', 1]]}