Question: which amendment to the us constitution abolished slavery
[{'answer': 'The Thirteenth', 'provenance': [{'wikipedia_id': '31665', 'title': 'Thirteenth Amendment to the United States Constitution', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '31665', 'title': 'Thirteenth Amendment to the United States Constitution', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 513, 'bleu_score': 0.976043556018343, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9362084274208132722}, 'section': 'Section::::Abstract.'}]}]