Question: where does the carbon in limestone come from
[{'answer': 'ooids', 'provenance': [{'wikipedia_id': '17748', 'title': 'Limestone', 'start_paragraph_id': 5, 'start_character': 326, 'end_paragraph_id': 5, 'end_character': 331, 'bleu_score': 1.0, 'section': 'Section::::Description.\n'}]}, {'answer': 'peloids', 'provenance': [{'wikipedia_id': '17748', 'title': 'Limestone', 'start_paragraph_id': 5, 'start_character': 333, 'end_paragraph_id': 5, 'end_character': 340, 'bleu_score': 1.0, 'section': 'Section::::Description.\n'}]}, {'answer': 'intraclasts', 'provenance': [{'wikipedia_id': '17748', 'title': 'Limestone', 'start_paragraph_id': 5, 'start_character': 342, 'end_paragraph_id': 5, 'end_character': 353, 'bleu_score': 1.0, 'section': 'Section::::Description.\n'}]}, {'answer': 'extraclasts', 'provenance': [{'wikipedia_id': '17748', 'title': 'Limestone', 'start_paragraph_id': 5, 'start_character': 359, 'end_paragraph_id': 5, 'end_character': 370, 'bleu_score': 1.0, 'section': 'Section::::Description.\n'}]}, {'provenance': [{'wikipedia_id': '17748', 'title': 'Limestone', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 370, 'bleu_score': 0.916705652864192, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6140632230455548169}, 'section': 'Section::::Description.\n'}]}]