Question: when did the cubs win their first world series
[{'answer': '1907', 'provenance': [{'wikipedia_id': '6654', 'title': 'Chicago Cubs', 'start_paragraph_id': 2, 'start_character': 318, 'end_paragraph_id': 2, 'end_character': 322, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6654', 'title': 'Chicago Cubs', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 916, 'bleu_score': 0.85676945657903, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10982879662595407109}, 'section': 'Section::::Abstract.'}]}]