Question: where does the name iron maiden come from
[{'answer': 'iron maiden torture device', 'provenance': [{'wikipedia_id': '159172', 'title': 'Iron Maiden', 'start_paragraph_id': 6, 'start_character': 292, 'end_paragraph_id': 6, 'end_character': 318, 'bleu_score': 1.0, 'section': 'Section::::History.:Early years (1975–1978).\n'}]}, {'provenance': [{'wikipedia_id': '159172', 'title': 'Iron Maiden', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 502, 'bleu_score': 0.8741457087324911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3536813173142745115}, 'section': 'Section::::History.:Early years (1975–1978).\n'}]}]