Question: when did oreo os cereal first come out
[{'answer': '1997', 'provenance': [{'wikipedia_id': '2075544', 'title': "Oreo O's", 'start_paragraph_id': 2, 'start_character': 27, 'end_paragraph_id': 2, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2075544', 'title': "Oreo O's", 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 199, 'bleu_score': 0.9402297675816911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2731983207617495468}, 'section': 'Section::::Abstract.'}]}]