Question: who won the title of world chess championship in 2017
[{'answer': 'Armenian grandmaster Levon Aronian', 'provenance': [{'wikipedia_id': '50731243', 'title': 'Chess World Cup 2017', 'start_paragraph_id': 1, 'start_character': 148, 'end_paragraph_id': 1, 'end_character': 182, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '50731243', 'title': 'Chess World Cup 2017', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 277, 'bleu_score': 0.8923575006167591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14951768055874820553}, 'section': 'Section::::Abstract.'}]}]