Question: who is the acting commissioner of social security
[{'answer': 'Carolyn W. Colvin', 'provenance': [{'wikipedia_id': '40183030', 'title': 'Carolyn Colvin', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '40183030', 'title': 'Carolyn Colvin', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 402, 'bleu_score': 0.927342992183329, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9051769395690725980}, 'section': 'Section::::Abstract.'}]}]