Question: when was the capital built in washington dc
[{'answer': '1800', 'provenance': [{'wikipedia_id': '31979', 'title': 'United States Capitol', 'start_paragraph_id': 2, 'start_character': 39, 'end_paragraph_id': 2, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]