Question: who does the voice of mcgruff the dog
[{'answer': 'Jack Keil', 'provenance': [{'wikipedia_id': '326842', 'title': 'McGruff the Crime Dog', 'start_paragraph_id': 10, 'start_character': 22, 'end_paragraph_id': 10, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::History.:Creation.\n'}]}, {'provenance': [{'wikipedia_id': '326842', 'title': 'McGruff the Crime Dog', 'start_paragraph_id': 24, 'start_character': 0, 'end_paragraph_id': 24, 'end_character': 470, 'bleu_score': 0.972782728923768, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1802616732911854174}, 'section': 'Section::::Campaigns.:Initial campaign.\n'}]}]