Question: when was oil first discovered in the us
[{'answer': '1859', 'provenance': [{'wikipedia_id': '13294', 'title': 'History of the petroleum industry in the United States', 'start_paragraph_id': 3, 'start_character': 91, 'end_paragraph_id': 3, 'end_character': 95, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '13294', 'title': 'History of the petroleum industry in the United States', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 275, 'bleu_score': 0.9603762111511761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7630494456370753472}, 'section': 'Section::::Abstract.'}]}]