Question: the largest suppliers of petroleum oil in the world
[{'answer': 'Russia', 'provenance': [{'wikipedia_id': '17756493', 'title': 'List of countries by oil production', 'start_paragraph_id': 3, 'start_character': 69, 'end_paragraph_id': 3, 'end_character': 75, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]