Question: when did the song iron man come out
[{'answer': '1970', 'provenance': [{'wikipedia_id': '1299122', 'title': 'Iron Man (song)', 'start_paragraph_id': 1, 'start_character': 108, 'end_paragraph_id': 1, 'end_character': 112, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]