Question: who won 2017-18 nba rookie of the year
[{'answer': 'Ben Simmons', 'provenance': [{'wikipedia_id': '631964', 'title': 'NBA Rookie of the Year Award', 'start_paragraph_id': 4, 'start_character': 63, 'end_paragraph_id': 4, 'end_character': 74, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '631964', 'title': 'NBA Rookie of the Year Award', 'start_paragraph_id': 3, 'start_character': 125, 'end_paragraph_id': 3, 'end_character': 864, 'bleu_score': 0.7012636640194371, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12244191802654162555}, 'section': 'Section::::Abstract.'}]}]