Question: who has the highest networth in the world 2017
[{'answer': 'Bill Gates', 'provenance': [{'wikipedia_id': '33331732', 'title': "The World's Billionaires", 'start_paragraph_id': 2, 'start_character': 352, 'end_paragraph_id': 2, 'end_character': 362, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '33331732', 'title': "The World's Billionaires", 'start_paragraph_id': 14, 'start_character': 104, 'end_paragraph_id': 14, 'end_character': 639, 'bleu_score': 0.5191867838540251, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3292249469649850787}, 'section': 'Section::::Annual rankings.:2017.\n'}]}]