Question: who has won the 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': 448, 'bleu_score': 0.705732417486792, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3334408566665408460}, 'section': 'Section::::Abstract.'}]}]