Question: how many liters is in a barrel of oil
[{'answer': '159 litres', 'provenance': [{'wikipedia_id': '594043', 'title': 'Barrel (unit)', 'start_paragraph_id': 28, 'start_character': 562, 'end_paragraph_id': 28, 'end_character': 572, 'bleu_score': 1.0, 'section': 'Section::::Oil barrel.:History.\n'}]}, {'provenance': [{'wikipedia_id': '594043', 'title': 'Barrel (unit)', 'start_paragraph_id': 25, 'start_character': 91, 'end_paragraph_id': 25, 'end_character': 593, 'bleu_score': 0.670533570408367, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17156893228912552807}, 'section': 'Section::::Oil barrel.\n'}]}]