Question: percentage of blood made up of red blood cells
[{'answer': '45 %', 'provenance': [{'wikipedia_id': '67159', 'title': 'Blood cell', 'start_paragraph_id': 7, 'start_character': 406, 'end_paragraph_id': 7, 'end_character': 412, 'bleu_score': 1.0, 'section': 'Section::::Red blood cells.\n'}]}]