Question: how many us states have no income tax
[{'answer': 'Nine', 'provenance': [{'wikipedia_id': '1416094', 'title': 'State income tax', 'start_paragraph_id': 25, 'start_character': 0, 'end_paragraph_id': 25, 'end_character': 4, 'bleu_score': 1.0, 'section': 'Section::::Individual income tax.:States with no individual income tax.\n'}]}, {'provenance': [{'wikipedia_id': '1416094', 'title': 'State income tax', 'start_paragraph_id': 25, 'start_character': 0, 'end_paragraph_id': 25, 'end_character': 120, 'bleu_score': 0.910879922930628, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13152883820490942380}, 'section': 'Section::::Individual income tax.:States with no individual income tax.\n'}]}]