Question: who won the last 20 over world cup
[{'answer': 'West Indies', 'provenance': [{'wikipedia_id': '42431723', 'title': 'History of the ICC T20 World Cup', 'start_paragraph_id': 1, 'start_character': 889, 'end_paragraph_id': 1, 'end_character': 900, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]