Question: who won the 2016-17 hsbc world rugby 7s series
[{'answer': 'South Africa', 'provenance': [{'wikipedia_id': '50574197', 'title': '2016–17 World Rugby Sevens Series', 'start_paragraph_id': 1, 'start_character': 259, 'end_paragraph_id': 1, 'end_character': 271, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '50574197', 'title': '2016–17 World Rugby Sevens Series', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 380, 'bleu_score': 0.8187956259693001, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9659407249697477045}, 'section': 'Section::::Abstract.'}]}]