Question: which gas is used in oxygen cylinder in hospital
[{'answer': 'Oxygen', 'provenance': [{'wikipedia_id': '2606275', 'title': 'Medical gas supply', 'start_paragraph_id': 11, 'start_character': 11, 'end_paragraph_id': 11, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2606275', 'title': 'Medical gas supply', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 679, 'bleu_score': 0.8332552644683511, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10106007372441858400}, 'section': 'Section::::Oxygen.\n'}]}]