Question: who defeated the spartans in a war in 371 bc
[{'answer': 'the Boeotians led by Thebans', 'provenance': [{'wikipedia_id': '82505', 'title': 'Battle of Leuctra', 'start_paragraph_id': 1, 'start_character': 73, 'end_paragraph_id': 1, 'end_character': 101, 'bleu_score': 0.668740304976422, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '82505', 'title': 'Battle of Leuctra', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 451, 'bleu_score': 0.8378778534534761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4267671595529864157}, 'section': 'Section::::Abstract.'}]}]