Question: what's the capital of mexico name in spanish
[{'answer': 'Ciudad de México', 'provenance': [{'wikipedia_id': '18987', 'title': 'Mexico City', 'start_paragraph_id': 77, 'start_character': 166, 'end_paragraph_id': 77, 'end_character': 182, 'bleu_score': 1.0, 'section': 'Section::::Politics.:Political structure.\n'}]}]