Question: where does the sweetness of fruit come from
[{'answer': 'Fructose', 'provenance': [{'wikipedia_id': '50337', 'title': 'Fructose', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 8, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Fructose , or fruit sugar', 'provenance': [{'wikipedia_id': '50337', 'title': 'Fructose', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '50337', 'title': 'Fructose', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 567, 'bleu_score': 0.8403563203465371, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5064693088289557692}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '50337', 'title': 'Fructose', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Fructose, or fruit sugar, is a simple ketonic monosaccharide found in many plants, where it is often bonded to glucose to form the disaccharide sucrose.', 'Fructose, or fruit sugar, is a simple ketonic monosaccharide found in many plants', 'fructose']}}]}]