Question: At the 71st annual Venice International Film Festival, the Silver Lion Grand Jury Prize was won by a 2014 international co-produced documentary that is a companion piece to what?
{'answer': 'The Act of Killing', 'supporting_facts': [['71st Venice International Film Festival', 0], ['71st Venice International Film Festival', 2], ['The Look of Silence', 0], ['The Look of Silence', 1]]}