Question: where does the funding for social security come from
[{'answer': 'payroll taxes', 'provenance': [{'wikipedia_id': '48728', 'title': 'Social Security (United States)', 'start_paragraph_id': 2, 'start_character': 44, 'end_paragraph_id': 2, 'end_character': 57, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '48728', 'title': 'Social Security (United States)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 650, 'bleu_score': 0.938201882005057, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6590345130475197368}, 'section': 'Section::::Abstract.'}]}]