Question: where do all nerves in the arm root from
[{'answer': 'brachial plexus', 'provenance': [{'wikipedia_id': '231479', 'title': 'Brachial plexus', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '231479', 'title': 'Brachial plexus', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 373, 'bleu_score': 0.9155272930874561, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10971613258429037865}, 'section': 'Section::::Abstract.'}]}]