Question: when did the sabre tooth tiger became extinct
[{'answer': 'about 10,000 years ago', 'provenance': [{'wikipedia_id': '169071', 'title': 'Smilodon', 'start_paragraph_id': 3, 'start_character': 750, 'end_paragraph_id': 3, 'end_character': 772, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '169071', 'title': 'Smilodon', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 946, 'bleu_score': 0.9645479622923241, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15095696100702875537}, 'section': 'Section::::Abstract.'}]}]