Question: when did the bp oil spill stop leaking
[{'answer': 'September 19 ,', 'provenance': [{'wikipedia_id': '28039038', 'title': 'Efforts to stem the Deepwater Horizon oil spill', 'start_paragraph_id': 25, 'start_character': 527, 'end_paragraph_id': 25, 'end_character': 546, 'bleu_score': 1.0, 'section': 'Section::::Non-explosive closure attempts.:Permanent closure.\n'}]}, {'provenance': [{'wikipedia_id': '28039038', 'title': 'Efforts to stem the Deepwater Horizon oil spill', 'start_paragraph_id': 25, 'start_character': 0, 'end_paragraph_id': 25, 'end_character': 605, 'bleu_score': 0.9306967934272391, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2967740900546114615}, 'section': 'Section::::Non-explosive closure attempts.:Permanent closure.\n'}]}]