Question: Which documentary did critic Roger Ebert call "one of the most powerful documentaries I've seen", 2006's Beyond the Call or 2000's Just, Melvin: Just Evil?
{'answer': 'Just, Melvin: Just Evil', 'supporting_facts': [['Beyond the Call', 0], ['Just, Melvin: Just Evil', 0], ['Just, Melvin: Just Evil', 2]]}