Question: when is the next mayoral election in nyc
[{'answer': 'November 7 , 2017', 'provenance': [{'wikipedia_id': '47604581', 'title': '2017 New York City mayoral election', 'start_paragraph_id': 1, 'start_character': 51, 'end_paragraph_id': 1, 'end_character': 68, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]