Question: who owns the biggest companies in the world
[{'answer': 'Walmart', 'provenance': [{'wikipedia_id': '997455', 'title': 'List of largest companies by revenue', 'start_paragraph_id': 1, 'start_character': 193, 'end_paragraph_id': 1, 'end_character': 200, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]