Question: who has the best boxing record of all times
[{'answer': 'Floyd Joy Mayweather Jr.', 'provenance': [{'wikipedia_id': '1388019', 'title': 'Floyd Mayweather Jr.', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 24, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1388019', 'title': 'Floyd Mayweather Jr.', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 652, 'bleu_score': 0.761510397314979, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11378535938815014948}, 'section': 'Section::::Abstract.'}]}]