Question: who is the head of department of transportation
[{'answer': 'Elaine Chao', 'provenance': [{'wikipedia_id': '45559', 'title': 'United States Secretary of Transportation', 'start_paragraph_id': 3, 'start_character': 110, 'end_paragraph_id': 3, 'end_character': 121, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '45559', 'title': 'United States Secretary of Transportation', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 314, 'bleu_score': 0.74766371227614, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14624271150497512097}, 'section': 'Section::::Abstract.'}]}]