Question: who has the legal authority to bind the us government on a us government contract
[{'answer': 'Federal Acquisition Regulation', 'provenance': [{'wikipedia_id': '4265145', 'title': 'Government procurement in the United States', 'start_paragraph_id': 21, 'start_character': 349, 'end_paragraph_id': 21, 'end_character': 379, 'bleu_score': 1.0, 'section': 'Section::::Law.\n'}]}, {'provenance': [{'wikipedia_id': '4265145', 'title': 'Government procurement in the United States', 'start_paragraph_id': 21, 'start_character': 0, 'end_paragraph_id': 21, 'end_character': 845, 'bleu_score': 0.955333150841943, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5779404720866585393}, 'section': 'Section::::Law.\n'}]}]