Question: what does the dc in washington dc stand for
[{'answer': 'District of Columbia', 'provenance': [{'wikipedia_id': '108956', 'title': 'Washington, D.C.', 'start_paragraph_id': 1, 'start_character': 31, 'end_paragraph_id': 1, 'end_character': 51, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '108956', 'title': 'Washington, D.C.', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 644, 'bleu_score': 0.706430791089371, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14157657227003687277}, 'section': 'Section::::Abstract.'}]}]