Question: what is the name of capital of argentina
[{'answer': 'Buenos Aires', 'provenance': [{'wikipedia_id': '18951905', 'title': 'Argentina', 'start_paragraph_id': 1, 'start_character': 648, 'end_paragraph_id': 1, 'end_character': 660, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18951905', 'title': 'Argentina', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 953, 'bleu_score': 0.779800383449408, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4911645197803522102}, 'section': 'Section::::Abstract.'}]}]