Question: mexico is led by a chief of state who is
[{'answer': 'Enrique Peña Nieto', 'provenance': [{'wikipedia_id': '24356889', 'title': 'President of Mexico', 'start_paragraph_id': 17, 'start_character': 173, 'end_paragraph_id': 17, 'end_character': 191, 'bleu_score': 1.0, 'section': 'Section::::Presidential elections.\n'}]}, {'provenance': [{'wikipedia_id': '24356889', 'title': 'President of Mexico', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 322, 'bleu_score': 0.64515602719951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11542493903410917143}, 'section': 'Section::::Abstract.'}]}]