Question: when did the red sox last win the world series
[{'answer': '2018', 'provenance': [{'wikipedia_id': '33367124', 'title': '2013 World Series', 'start_paragraph_id': 37, 'start_character': 136, 'end_paragraph_id': 37, 'end_character': 140, 'bleu_score': 1.0, 'section': 'Section::::Matchups.:Game 6.\n'}]}]