Question: what weight class is mayweather and mcgregor fighting at
[{'answer': 'light - middleweight weight class', 'provenance': [{'wikipedia_id': '54304370', 'title': 'Floyd Mayweather Jr. vs. Conor McGregor', 'start_paragraph_id': 1, 'start_character': 445, 'end_paragraph_id': 1, 'end_character': 478, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '54304370', 'title': 'Floyd Mayweather Jr. vs. Conor McGregor', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 548, 'bleu_score': 0.8647152070995451, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3974417472420625743}, 'section': 'Section::::Abstract.'}]}]