Question: when did plasma become a state of matter
[{'answer': '1920s', 'provenance': [{'wikipedia_id': '25916521', 'title': 'Plasma (physics)', 'start_paragraph_id': 1, 'start_character': 117, 'end_paragraph_id': 1, 'end_character': 122, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25916521', 'title': 'Plasma (physics)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 510, 'bleu_score': 0.5448998686331981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16986559387699416318}, 'section': 'Section::::Abstract.'}]}]