Question: when did the gold rush start in alaska
[{'answer': 'the summer of 1899', 'provenance': [{'wikipedia_id': '192748', 'title': 'Klondike Gold Rush', 'start_paragraph_id': 7, 'start_character': 104, 'end_paragraph_id': 7, 'end_character': 122, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '192748', 'title': 'Klondike Gold Rush', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 336, 'bleu_score': 0.56859748354836, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6430228244037771845}, 'section': 'Section::::Abstract.'}]}]