Question: who is the secretary of state of usa
[{'answer': 'Rex Tillerson', 'provenance': [{'wikipedia_id': '32293', 'title': 'United States Secretary of State', 'start_paragraph_id': 3, 'start_character': 133, 'end_paragraph_id': 3, 'end_character': 146, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]