Question: what region of the world is mexico city in
[{'answer': 'Americas', 'provenance': [{'wikipedia_id': '18987', 'title': 'Mexico City', 'start_paragraph_id': 1, 'start_character': 204, 'end_paragraph_id': 1, 'end_character': 212, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]