Question: who takes care of the president's schedule
[{'answer': 'White House chief of staff', 'provenance': [{'wikipedia_id': '212934', 'title': 'White House Chief of Staff', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 30, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '212934', 'title': 'White House Chief of Staff', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 510, 'bleu_score': 0.915331514722108, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7480917156474746682}, 'section': 'Section::::History.\n'}]}]