Question: when was oil first used as an energy source
[{'answer': 'fourth century BCE', 'provenance': [{'wikipedia_id': '9963332', 'title': 'History of the petroleum industry', 'start_paragraph_id': 4, 'start_character': 317, 'end_paragraph_id': 4, 'end_character': 335, 'bleu_score': 1.0, 'section': 'Section::::Early history.\n'}]}, {'provenance': [{'wikipedia_id': '9963332', 'title': 'History of the petroleum industry', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 335, 'bleu_score': 0.806345193048777, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5516261419579091663}, 'section': 'Section::::Early history.\n'}]}]