Question: who is the highest ranking military officer today
[{'answer': 'President', 'provenance': [{'wikipedia_id': '195322', 'title': 'Joint Chiefs of Staff', 'start_paragraph_id': 1, 'start_character': 131, 'end_paragraph_id': 1, 'end_character': 140, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '195322', 'title': 'Joint Chiefs of Staff', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 389, 'bleu_score': 0.9663744727315161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8951635753839000416}, 'section': 'Section::::Role and responsibilities.\n'}]}]