Question: which layer of the earth is responsible for its magnetic field
[{'answer': 'outer core', 'provenance': [{'wikipedia_id': '146983', 'title': "Earth's magnetic field", 'start_paragraph_id': 1, 'start_character': 356, 'end_paragraph_id': 1, 'end_character': 366, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '146983', 'title': "Earth's magnetic field", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 957, 'bleu_score': 0.820301801919002, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16110496503265242102}, 'section': 'Section::::Abstract.'}]}]