Question: is the eiffel tower made of steel or iron
[{'answer': 'wrought iron', 'provenance': [{'wikipedia_id': '9232', 'title': 'Eiffel Tower', 'start_paragraph_id': 52, 'start_character': 18, 'end_paragraph_id': 52, 'end_character': 30, 'bleu_score': 1.0, 'section': 'Section::::Design.:Material.\n'}]}, {'provenance': [{'wikipedia_id': '9232', 'title': 'Eiffel Tower', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 183, 'bleu_score': 0.621975521477779, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14508476864501454572}, 'section': 'Section::::Abstract.'}]}]