Question: rust on an iron nail element or compound
[{'answer': 'compound', 'provenance': [{'wikipedia_id': '26477', 'title': 'Rust', 'start_paragraph_id': 6, 'start_character': 245, 'end_paragraph_id': 6, 'end_character': 253, 'bleu_score': 1.0, 'section': 'Section::::Chemical reactions.\n'}]}, {'provenance': [{'wikipedia_id': '26477', 'title': 'Rust', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 502, 'bleu_score': 0.7022463809881141, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8245167550468411865}, 'section': 'Section::::Chemical reactions.\n'}]}]