Question: how many members are there in the straw hat pirates
[{'answer': 'nine pirates'}, {'provenance': [{'wikipedia_id': '14439630', 'title': 'List of One Piece characters', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 765, 'bleu_score': 0.9155150587239711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3154065844909427740}, 'section': 'Section::::Straw Hat Pirates.\n'}]}]