Question: who was the first african american to serve on the supreme court
[{'answer': 'Thurgood Marshall', 'provenance': [{'wikipedia_id': '57445', 'title': 'Thurgood Marshall', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '57445', 'title': 'Thurgood Marshall', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 355, 'bleu_score': 0.965203995518735, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9014654585335456487}, 'section': 'Section::::Abstract.'}]}]