Question: who is d richest man in d world 2018
[{'answer': 'Jeff Bezos', 'provenance': [{'wikipedia_id': '33331732', 'title': "The World's Billionaires", 'start_paragraph_id': 2, 'start_character': 429, 'end_paragraph_id': 2, 'end_character': 439, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]