Question: when did the acer chromebook 15 come out
[{'answer': 'January 2015', 'provenance': [{'wikipedia_id': '31747219', 'title': 'Chromebook', 'start_paragraph_id': 9, 'start_character': 3, 'end_paragraph_id': 9, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '31747219', 'title': 'Chromebook', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 117, 'bleu_score': 0.7661195635495951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15973397187192777341}, 'section': 'Section::::History.\n'}]}]