Question: where does the spinal cord become cauda equina
[{'answer': 'L1 or L2', 'provenance': [{'wikipedia_id': '240490', 'title': 'Cauda equina', 'start_paragraph_id': 4, 'start_character': 303, 'end_paragraph_id': 4, 'end_character': 311, 'bleu_score': 1.0, 'section': 'Section::::Structure.:Development.\n'}]}, {'answer': 'the conus medullaris'}, {'answer': 'from the lumbar enlargement and the conus medullaris'}, {'provenance': [{'wikipedia_id': '240490', 'title': 'Cauda equina', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14636065860824909149}, 'section': 'Section::::Abstract.'}]}, {}, {'provenance': [{'wikipedia_id': '240490', 'title': 'Cauda equina', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 932, 'bleu_score': 0.967289310917216, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14636065860824909149}, 'section': 'Section::::Structure.:Development.\n'}]}, {'provenance': [{'wikipedia_id': '1384898', 'title': 'Cauda equina syndrome', 'section': 'Section::::Epidemiology.\n', 'start_paragraph_id': 47, 'end_paragraph_id': 47, 'meta': {'evidence_span': ['conus medullaris and the cauda equina, particularly between T12 and L2', 'additional scrutiny. Traumatic spinal cord injuries occur in approximately 40 people per million annually in the United States, resulting from traumas due to motor vehicle accidents, sporting injuries, falls, and other factors. An estimated 10 to 25% of vertebral fractures will result in injury to the spinal cord. Thorough physical examinations are required, as 5 to 15% of trauma patients have fractures that initially go undiagnosed. The most frequent injuries of the thoracolumbar region are to the conus medullaris and the cauda equina, particularly between T12 and L2', 'The most frequent injuries of the thoracolumbar region are to the conus medullaris and the cauda equina, particularly between T12 and L2']}}]}]