Question: who won olympic gold in womens hockey 2018
[{'answer': 'United States', 'provenance': [{'wikipedia_id': '1690430', 'title': "United States women's national ice hockey team", 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]