Question: what kind of operating system is a chrome book
[{'answer': 'Chrome OS', 'provenance': [{'wikipedia_id': '23533163', 'title': 'Chrome OS', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 9, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23533163', 'title': 'Chrome OS', 'start_paragraph_id': 1, 'start_character': 13, 'end_paragraph_id': 1, 'end_character': 250, 'bleu_score': 0.649826710677456, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5506432081941461567}, 'section': 'Section::::Abstract.'}]}]