Question: who did abraham marry after the death of sarah
[{'answer': 'Keturah', 'provenance': [{'wikipedia_id': '708395', 'title': 'Keturah', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '708395', 'title': 'Keturah', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 240, 'bleu_score': 0.803739644421938, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16600704626114331809}, 'section': 'Section::::Abstract.'}]}]