Question: what is the voice and brain behind the echo device is called
[{'answer': 'Alexa', 'provenance': [{'wikipedia_id': '44331153', 'title': 'Amazon Echo', 'start_paragraph_id': 1, 'start_character': 58, 'end_paragraph_id': 1, 'end_character': 63, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '44331153', 'title': 'Amazon Echo', 'start_paragraph_id': 1, 'start_character': 26, 'end_paragraph_id': 1, 'end_character': 638, 'bleu_score': 0.6510278553337541, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11561270949138212628}, 'section': 'Section::::Abstract.'}]}]