Question: who played johnny cash's dad in walk the line
[{'answer': 'Robert Patrick', 'provenance': [{'wikipedia_id': '1641890', 'title': 'Walk the Line', 'start_paragraph_id': 1, 'start_character': 482, 'end_paragraph_id': 1, 'end_character': 496, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]