Question: when was the last time red sox won world series
[{'answer': '2013', 'provenance': [{'wikipedia_id': '4339', 'title': 'Boston Red Sox', 'start_paragraph_id': 3, 'start_character': 321, 'end_paragraph_id': 3, 'end_character': 325, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4339', 'title': 'Boston Red Sox', 'start_paragraph_id': 88, 'start_character': 0, 'end_paragraph_id': 88, 'end_character': 2556, 'bleu_score': 0.9394313282245351, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3814009086394345454}, 'section': 'Section::::History.:2002–present: John Henry era.:Boston Strong: 2013 World Series Champions.\n'}]}]