Question: what material is the angel of the north made from
[{'answer': 'steel', 'provenance': [{'wikipedia_id': '358435', 'title': 'Angel of the North', 'start_paragraph_id': 2, 'start_character': 27, 'end_paragraph_id': 2, 'end_character': 32, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '358435', 'title': 'Angel of the North', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 267, 'bleu_score': 0.568201291667466, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4988088399071071827}, 'section': 'Section::::Abstract.'}]}]