Question: what is the measurement of an acre in square feet
[{'answer': '43,560 square feet', 'provenance': [{'wikipedia_id': '1797', 'title': 'Acre', 'start_paragraph_id': 1, 'start_character': 230, 'end_paragraph_id': 1, 'end_character': 248, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1797', 'title': 'Acre', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 775, 'bleu_score': 0.865902543208748, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11366605039394507587}, 'section': 'Section::::Description.\n'}]}]