Question: when did girl scouts first start selling cookies
[{'answer': '1917', 'provenance': [{'wikipedia_id': '329180', 'title': 'Girl Scout Cookies', 'start_paragraph_id': 1, 'start_character': 426, 'end_paragraph_id': 1, 'end_character': 430, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]