Question: how many gallons of water in a barrell
[{'answer': '22 to 44 imp gal'}, {'answer': '26 to 53 US gal'}, {'provenance': [{'wikipedia_id': '594043', 'title': 'Barrel (unit)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 408, 'bleu_score': 0.759484567385145, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10828163442978977409}, 'section': 'Section::::Abstract.'}]}]