Question: what is the most fundamental source of law in the united states
[{'answer': 'The Constitution', 'provenance': [{'wikipedia_id': '27552742', 'title': 'Law of the United States', 'start_paragraph_id': 1, 'start_character': 211, 'end_paragraph_id': 1, 'end_character': 227, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '27552742', 'title': 'Law of the United States', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 553, 'bleu_score': 0.9135460396592721, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8582602954749844777}, 'section': 'Section::::Abstract.'}]}]