Question: who heads the department of health and human services
[{'answer': 'Alex Azar', 'provenance': [{'wikipedia_id': '44279', 'title': 'United States Secretary of Health and Human Services', 'start_paragraph_id': 5, 'start_character': 515, 'end_paragraph_id': 5, 'end_character': 524, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '44279', 'title': 'United States Secretary of Health and Human Services', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 777, 'bleu_score': 0.984789766484456, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15592540607390982648}, 'section': 'Section::::Abstract.'}]}]