Question: who has the most championships rings in the nba
[{'answer': 'Bill Russell', 'provenance': [{'wikipedia_id': '10110325', 'title': 'List of NBA players with most championships', 'start_paragraph_id': 2, 'start_character': 22, 'end_paragraph_id': 2, 'end_character': 34, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '10110325', 'title': 'List of NBA players with most championships', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1112, 'bleu_score': 0.852595369978796, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14037347125139074189}, 'section': 'Section::::Abstract.'}]}]