Question: when was slavery abolished in the british colonies
[{'answer': '1833', 'provenance': [{'wikipedia_id': '1811656', 'title': 'Slavery Abolition Act 1833', 'start_paragraph_id': 0, 'start_character': 22, 'end_paragraph_id': 0, 'end_character': 26, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1811656', 'title': 'Slavery Abolition Act 1833', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 586, 'bleu_score': 0.827555251451162, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17931849013813481749}, 'section': 'Section::::Abstract.'}]}]