Question: where do short chain fatty acids in the colon come from
[{'answer': 'when dietary fiber is fermented', 'provenance': [{'wikipedia_id': '11869024', 'title': 'Short-chain fatty acid', 'start_paragraph_id': 3, 'start_character': 19, 'end_paragraph_id': 3, 'end_character': 50, 'bleu_score': 1.0, 'section': 'Section::::Functions.\n'}]}, {'provenance': [{'wikipedia_id': '11869024', 'title': 'Short-chain fatty acid', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 63, 'bleu_score': 0.5828233954152651, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5302677243053614993}, 'section': 'Section::::Functions.\n'}]}]