Question: when did they take lead out of gas
[{'answer': '2011', 'provenance': [{'wikipedia_id': '116035', 'title': 'Tetraethyllead', 'start_paragraph_id': 26, 'start_character': 182, 'end_paragraph_id': 26, 'end_character': 186, 'bleu_score': 1.0, 'section': 'Section::::In motor fuel.:Phaseout and ban.\n'}]}, {'provenance': [{'wikipedia_id': '116035', 'title': 'Tetraethyllead', 'start_paragraph_id': 148, 'start_character': 0, 'end_paragraph_id': 148, 'end_character': 507, 'bleu_score': 0.937875816952289, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2686417844188290097}, 'section': 'Section::::History.:Controversy and phase-out.\n'}]}]