Question: why is the short form of pounds lbs
[{'answer': 'libra', 'provenance': [{'wikipedia_id': '23316', 'title': 'Pound (mass)', 'start_paragraph_id': 3, 'start_character': 38, 'end_paragraph_id': 3, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': "Latin for `` scales / balance ''"}, {'provenance': [{'wikipedia_id': '23316', 'title': 'Pound (mass)', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 248, 'bleu_score': 0.9517713210466091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8883413224539448406}, 'section': 'Section::::Historic use.:Roman "libra".\n'}]}]