Question: who invented the gas mask in world war 1
[{'answer': 'Cluny Macpherson', 'provenance': [{'wikipedia_id': '1792962', 'title': 'Cluny Macpherson (physician)', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1792962', 'title': 'Cluny Macpherson (physician)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 229, 'bleu_score': 0.8344883669973671, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9829276149836418482}, 'section': 'Section::::Abstract.'}]}]