Question: who is the head of the federal bureau of prisons
[{'answer': 'Hugh Hurwitz', 'provenance': [{'wikipedia_id': '1271411', 'title': 'Federal Bureau of Prisons', 'start_paragraph_id': 8, 'start_character': 132, 'end_paragraph_id': 8, 'end_character': 144, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1271411', 'title': 'Federal Bureau of Prisons', 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 131, 'bleu_score': 0.588068915064469, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10470369293162220883}, 'section': 'Section::::Administration and employees.\n'}]}]