Question: where does the united states buy oil from
[{'answer': 'Canada', 'provenance': [{'wikipedia_id': '19086358', 'title': 'Petroleum in the United States', 'start_paragraph_id': 4, 'start_character': 493, 'end_paragraph_id': 4, 'end_character': 499, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Saudi Arabia', 'provenance': [{'wikipedia_id': '19086358', 'title': 'Petroleum in the United States', 'start_paragraph_id': 4, 'start_character': 507, 'end_paragraph_id': 4, 'end_character': 519, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Venezuela', 'provenance': [{'wikipedia_id': '19086358', 'title': 'Petroleum in the United States', 'start_paragraph_id': 4, 'start_character': 527, 'end_paragraph_id': 4, 'end_character': 536, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Mexico', 'provenance': [{'wikipedia_id': '19086358', 'title': 'Petroleum in the United States', 'start_paragraph_id': 1, 'start_character': 491, 'end_paragraph_id': 1, 'end_character': 497, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Colombia', 'provenance': [{'wikipedia_id': '19086358', 'title': 'Petroleum in the United States', 'start_paragraph_id': 4, 'start_character': 560, 'end_paragraph_id': 4, 'end_character': 568, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19086358', 'title': 'Petroleum in the United States', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 571, 'bleu_score': 0.916868163030056, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3348463844007681386}, 'section': 'Section::::Abstract.'}]}]