Question: who played johnny cash in i walk the line
[{'answer': 'Joaquin Phoenix', 'provenance': [{'wikipedia_id': '1641890', 'title': 'Walk the Line', 'start_paragraph_id': 1, 'start_character': 370, 'end_paragraph_id': 1, 'end_character': 385, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1641890', 'title': 'Walk the Line', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 513, 'bleu_score': 0.7744652954559681, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8813993246207541983}, 'section': 'Section::::Abstract.'}]}]