Question: who has won the most nfl championships ever
[{'answer': 'Green Bay Packers', 'provenance': [{'wikipedia_id': '656892', 'title': 'History of the National Football League championship', 'start_paragraph_id': 3, 'start_character': 706, 'end_paragraph_id': 3, 'end_character': 723, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '656892', 'title': 'History of the National Football League championship', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 1091, 'bleu_score': 0.918324711660454, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13236569873197694346}, 'section': 'Section::::Abstract.'}]}]