Question: how many aircraft carriers did the united states build during world war ii
[{'answer': 'twenty - seven', 'provenance': [{'wikipedia_id': '32674473', 'title': 'United States Navy in World War II', 'start_paragraph_id': 6, 'start_character': 101, 'end_paragraph_id': 6, 'end_character': 122, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '32674473', 'title': 'United States Navy in World War II', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 298, 'bleu_score': 0.9118021019905901, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6201247095806917454}, 'section': 'Section::::Abstract.'}]}]