Question: what breed of dog is a presa canario
[{'answer': 'Mastiff', 'provenance': [{'wikipedia_id': '724222', 'title': 'Perro de Presa Canario', 'start_paragraph_id': 1, 'start_character': 46, 'end_paragraph_id': 1, 'end_character': 53, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '724222', 'title': 'Perro de Presa Canario', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 388, 'bleu_score': 0.9452425713908251, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8167236853310287933}, 'section': 'Section::::Abstract.'}]}]