Question: how many world series did the pittsburgh pirates win
[{'answer': '5', 'provenance': [{'wikipedia_id': '24270', 'title': 'Pittsburgh Pirates', 'start_paragraph_id': 1, 'start_character': 468, 'end_paragraph_id': 1, 'end_character': 469, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]