Question: who has won the 2018 women's singles title in the australian open 2018
[{'answer': 'Caroline Wozniacki', 'provenance': [{'wikipedia_id': '55901830', 'title': "2018 Australian Open – Women's Singles", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '55901830', 'title': "2018 Australian Open – Women's Singles", 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 473, 'bleu_score': 0.7370550517181851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5787518158849053546}, 'section': 'Section::::Abstract.'}]}]