Question: which organization developed the standard definition of social work in the united states
[{'answer': 'the Charity Organization Society', 'provenance': [{'wikipedia_id': '146717', 'title': 'Social work', 'start_paragraph_id': 7, 'start_character': 217, 'end_paragraph_id': 7, 'end_character': 249, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '146717', 'title': 'Social work', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 1184, 'bleu_score': 0.9889802957688271, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 169056181270726142}, 'section': 'Section::::History.\n'}]}]