Question: when is the european cup final being played
[{'answer': '26 May 2018', 'provenance': [{'wikipedia_id': '51615375', 'title': '2018 UEFA Champions League Final', 'start_paragraph_id': 1, 'start_character': 333, 'end_paragraph_id': 1, 'end_character': 344, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '51615375', 'title': '2018 UEFA Champions League Final', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 491, 'bleu_score': 0.9361374222844411, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3159177063118216591}, 'section': 'Section::::Abstract.'}]}]