Question: who heads up the department of justice under the executive branch
[{'answer': 'Jeff Sessions'}, {'provenance': [{'wikipedia_id': '52563', 'title': 'United States Department of Justice', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 189, 'bleu_score': 0.887204876284519, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11170172771191231027}, 'section': 'Section::::Abstract.'}]}]