Question: vitamin b12 is essential for the proper functioning o
[{'answer': 'of the nervous system', 'provenance': [{'wikipedia_id': '14538619', 'title': 'Vitamin B12', 'start_paragraph_id': 1, 'start_character': 271, 'end_paragraph_id': 1, 'end_character': 292, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14538619', 'title': 'Vitamin B12', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 404, 'bleu_score': 0.937535115907385, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12923079853649863175}, 'section': 'Section::::Abstract.'}]}]