Question: what functional group in glucose has reducing properties
[{'answer': 'aldehyde', 'provenance': [{'wikipedia_id': '987423', 'title': 'Reducing sugar', 'start_paragraph_id': 1, 'start_character': 98, 'end_paragraph_id': 1, 'end_character': 106, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '987423', 'title': 'Reducing sugar', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 299, 'bleu_score': 0.9529077664391161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17894064250994553149}, 'section': 'Section::::Examples.\n'}]}]