Question: when did the last wooly mammoths die out
[{'answer': '4,000 years ago', 'provenance': [{'wikipedia_id': '17369680', 'title': 'Woolly mammoth', 'start_paragraph_id': 3, 'start_character': 467, 'end_paragraph_id': 3, 'end_character': 482, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '17369680', 'title': 'Woolly mammoth', 'start_paragraph_id': 54, 'start_character': 0, 'end_paragraph_id': 54, 'end_character': 1362, 'bleu_score': 0.9905434697047311, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10259243026794729248}, 'section': 'Section::::Extinction.\n'}]}]