Question: which layer of earth is responsible for magnetic field
[{'answer': "the Earth 's outer core", 'provenance': [{'wikipedia_id': '146983', 'title': "Earth's magnetic field", 'start_paragraph_id': 68, 'start_character': 30, 'end_paragraph_id': 68, 'end_character': 56, 'bleu_score': 1.0, 'section': "Section::::Physical origin.:Earth's core and the geodynamo.\n"}]}, {'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': 10600373307155450490}, 'section': 'Section::::Abstract.'}]}]