Question: who won the australian women's open tennis tournament
[{'answer': 'Serena Williams', 'provenance': [{'wikipedia_id': '51884453', 'title': '2017 Australian Open', 'start_paragraph_id': 3, 'start_character': 240, 'end_paragraph_id': 3, 'end_character': 255, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '51884453', 'title': '2017 Australian Open', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 416, 'bleu_score': 0.974188104609039, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13076398974349753596}, 'section': 'Section::::Abstract.'}]}]