Question: Kopparvallen is a multi-use stadium in Åtvidaberg, Sweden, famous football players who have played in the arena includes which former footballer from Sweden, and he participated at the World Cups 1974 FIFA World Cup and 1978 FIFA World Cup?
{'answer': 'Conny Torstensson', 'supporting_facts': [['Kopparvallen', 3], ['Conny Torstensson', 0]]}