Question: when was the cure for scarlet fever discovered
[{'answer': 'Scarlet fever serum', 'provenance': [{'wikipedia_id': '26955920', 'title': 'Scarlet fever serum', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]