Question: the ____ amendment authorized congress to levy an income tax
[{'answer': 'Sixteenth', 'provenance': [{'wikipedia_id': '31668', 'title': 'Sixteenth Amendment to the United States Constitution', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 9, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]