Question: how much did della sell her hair for
[{'answer': '$20', 'provenance': [{'wikipedia_id': '43068', 'title': 'The Gift of the Magi', 'start_paragraph_id': 4, 'start_character': 100, 'end_paragraph_id': 4, 'end_character': 103, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}]