Question: when did federal income tax came into being
[{'answer': 'August 5 , 1861', 'provenance': [{'wikipedia_id': '50845', 'title': 'Income tax', 'start_paragraph_id': 21, 'start_character': 67, 'end_paragraph_id': 21, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::History.:Modern era.:United States.\n'}]}, {'provenance': [{'wikipedia_id': '50845', 'title': 'Income tax', 'start_paragraph_id': 21, 'start_character': 0, 'end_paragraph_id': 21, 'end_character': 796, 'bleu_score': 0.9279429452268521, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12168785059631937122}, 'section': 'Section::::History.:Modern era.:United States.\n'}]}]