Question: what was the capital of brazil before brasilia
[{'answer': 'Rio de Janeiro', 'provenance': [{'wikipedia_id': '13458361', 'title': 'Capitals of Brazil', 'start_paragraph_id': 1, 'start_character': 76, 'end_paragraph_id': 1, 'end_character': 90, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]