Question: what type of party system does mexico have
[{'answer': 'multi-party system', 'provenance': [{'wikipedia_id': '19225', 'title': 'Politics of Mexico', 'start_paragraph_id': 1, 'start_character': 250, 'end_paragraph_id': 1, 'end_character': 268, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19225', 'title': 'Politics of Mexico', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 677, 'bleu_score': 0.9305956054495311, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6495178449157007235}, 'section': 'Section::::Abstract.'}]}]