Question: who was the first to measure the earth circumference
[{'answer': 'Eratosthenes', 'provenance': [{'wikipedia_id': '46117', 'title': 'Eratosthenes', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46117', 'title': 'Eratosthenes', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 285, 'bleu_score': 0.641935893875756, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 789654682347508713}, 'section': 'Section::::Abstract.'}]}]