Question: when did the brown vs board of education end
[{'answer': 'May 17 , 1954', 'provenance': [{'wikipedia_id': '66402', 'title': 'Brown v. Board of Education', 'start_paragraph_id': 32, 'start_character': 3, 'end_paragraph_id': 32, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::Case.:Decision.\n'}]}]