Question: who won the battle of the sexes in 1973
[{'answer': 'Billie Jean King', 'provenance': [{'wikipedia_id': '6531362', 'title': 'Battle of the Sexes (tennis)', 'start_paragraph_id': 1, 'start_character': 353, 'end_paragraph_id': 1, 'end_character': 369, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6531362', 'title': 'Battle of the Sexes (tennis)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 581, 'bleu_score': 0.915001303192125, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2597987013221231732}, 'section': 'Section::::Abstract.'}]}]