Question: who played the title role in barry lindon
[{'answer': "Ryan O'Neal", 'provenance': [{'wikipedia_id': '4227', 'title': 'Barry Lyndon', 'start_paragraph_id': 1, 'start_character': 153, 'end_paragraph_id': 1, 'end_character': 164, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4227', 'title': 'Barry Lyndon', 'start_paragraph_id': 25, 'start_character': 0, 'end_paragraph_id': 25, 'end_character': 68, 'bleu_score': 0.7860753021519781, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6884529459852058887}, 'section': 'Section::::Cast.\n'}]}]