Question: what is the first day of fall in north america
[{'answer': 'September 21', 'provenance': [{'wikipedia_id': '3049', 'title': 'Autumn', 'start_paragraph_id': 3, 'start_character': 49, 'end_paragraph_id': 3, 'end_character': 61, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3049', 'title': 'Autumn', 'start_paragraph_id': 3, 'start_character': 66, 'end_paragraph_id': 3, 'end_character': 1158, 'bleu_score': 0.8859205944582391, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17186628162591928536}, 'section': 'Section::::Abstract.'}]}]