Question: which city is niagara falls located in canada
[{'answer': 'Ontario', 'provenance': [{'wikipedia_id': '180174', 'title': 'Niagara Falls, Ontario', 'start_paragraph_id': 0, 'start_character': 15, 'end_paragraph_id': 0, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '180174', 'title': 'Niagara Falls, Ontario', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 293, 'bleu_score': 0.871193686378211, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1339957752692573137}, 'section': 'Section::::Abstract.'}]}]