Question: chemist who contributed towards the discovery of oxygen
[{'answer': 'Carl Wilhelm Scheele', 'provenance': [{'wikipedia_id': '59483', 'title': 'Carl Wilhelm Scheele', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '59483', 'title': 'Carl Wilhelm Scheele', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 705, 'bleu_score': 0.928036074738358, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7959112793099201872}, 'section': 'Section::::Abstract.'}]}]