Question: who is the fbi agent in national treasure
[{'answer': 'Harvey Keitel', 'provenance': [{'wikipedia_id': '699208', 'title': 'National Treasure (film)', 'start_paragraph_id': 1, 'start_character': 279, 'end_paragraph_id': 1, 'end_character': 292, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '699208', 'title': 'National Treasure (film)', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 126, 'bleu_score': 0.9021315316859231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4649173675880738680}, 'section': 'Section::::Cast.\n'}]}]