Question: when was vitamin c discovered and by whom
[{'answer': '1928 to 1932', 'provenance': [{'wikipedia_id': '32509', 'title': 'Vitamin C', 'start_paragraph_id': 131, 'start_character': 5, 'end_paragraph_id': 131, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::History.:Discovery.\n'}]}, {'answer': "Albert Szent - Györgyi and Joseph L. Svirbely 's Hungarian team , and Charles Glen King 's American team"}, {'provenance': [{'wikipedia_id': '32509', 'title': 'Vitamin C', 'start_paragraph_id': 131, 'start_character': 0, 'end_paragraph_id': 131, 'end_character': 1258, 'bleu_score': 0.927456414609485, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 75858852211634609}, 'section': 'Section::::History.:Discovery.\n'}]}]