Question: name of the windows phone 8.1 virtual assistant
[{'answer': 'Cortana', 'provenance': [{'wikipedia_id': '41917266', 'title': 'Windows Phone 8.1', 'start_paragraph_id': 12, 'start_character': 11, 'end_paragraph_id': 12, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Features.\n'}]}, {'provenance': [{'wikipedia_id': '41917266', 'title': 'Windows Phone 8.1', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 516, 'bleu_score': 0.976043556018343, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2787461197185474067}, 'section': 'Section::::Features.:Cortana.\n'}]}]