Question: what is the definition of low birth weight
[{'answer': '2,499 g or less', 'provenance': [{'wikipedia_id': '1973352', 'title': 'Low birth weight', 'start_paragraph_id': 2, 'start_character': 10, 'end_paragraph_id': 2, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1973352', 'title': 'Low birth weight', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 327, 'bleu_score': 0.709164158692815, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16139908557375668668}, 'section': 'Section::::Abstract.'}]}]