Question: when is the closing ceremonies of the 2018 winter olympics
[{'answer': '25 February 2018', 'provenance': [{'wikipedia_id': '51310935', 'title': '2018 Winter Olympics closing ceremony', 'start_paragraph_id': 1, 'start_character': 123, 'end_paragraph_id': 1, 'end_character': 139, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '51310935', 'title': '2018 Winter Olympics closing ceremony', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 152, 'bleu_score': 0.681394337590571, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4836591593130288978}, 'section': 'Section::::Abstract.'}]}]