Question: what sample of matter is classified as a substance
[{'answer': 'alloys', 'provenance': [{'wikipedia_id': '9722260', 'title': 'Chemical substance', 'start_paragraph_id': 1, 'start_character': 320, 'end_paragraph_id': 1, 'end_character': 326, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'ions', 'provenance': [{'wikipedia_id': '9722260', 'title': 'Chemical substance', 'start_paragraph_id': 3, 'start_character': 236, 'end_paragraph_id': 3, 'end_character': 240, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'chemical compounds', 'provenance': [{'wikipedia_id': '9722260', 'title': 'Chemical substance', 'start_paragraph_id': 1, 'start_character': 297, 'end_paragraph_id': 1, 'end_character': 315, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'chemical elements', 'provenance': [{'wikipedia_id': '9722260', 'title': 'Chemical substance', 'start_paragraph_id': 11, 'start_character': 578, 'end_paragraph_id': 11, 'end_character': 595, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '9722260', 'title': 'Chemical substance', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 345, 'bleu_score': 0.5408927148931141, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15919327068256408115}, 'section': 'Section::::Abstract.'}]}]