Question: who used the first standardized system of measurement
[{'answer': 'Egypt', 'provenance': [{'wikipedia_id': '2752651', 'title': 'History of measurement', 'start_paragraph_id': 4, 'start_character': 484, 'end_paragraph_id': 4, 'end_character': 489, 'bleu_score': 1.0, 'section': 'Section::::Sources of information.\n'}]}, {'answer': 'Mesopotamia', 'provenance': [{'wikipedia_id': '2752651', 'title': 'History of measurement', 'start_paragraph_id': 6, 'start_character': 170, 'end_paragraph_id': 6, 'end_character': 181, 'bleu_score': 1.0, 'section': 'Section::::Earliest known systems.\n'}]}, {'answer': 'Indus Valley', 'provenance': [{'wikipedia_id': '2752651', 'title': 'History of measurement', 'start_paragraph_id': 6, 'start_character': 190, 'end_paragraph_id': 6, 'end_character': 202, 'bleu_score': 1.0, 'section': 'Section::::Earliest known systems.\n'}]}, {'answer': 'perhaps also Elam ( in Iran )'}, {'provenance': [{'wikipedia_id': '2752651', 'title': 'History of measurement', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 243, 'bleu_score': 0.955027111100031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10615310942118806066}, 'section': 'Section::::Earliest known systems.\n'}]}]