Question: who played mr. o'hara in gone with the wind
[{'answer': 'Thomas Mitchell', 'provenance': [{'wikipedia_id': '2804704', 'title': 'Gone with the Wind (film)', 'start_paragraph_id': 10, 'start_character': 463, 'end_paragraph_id': 10, 'end_character': 478, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}, {'provenance': [{'wikipedia_id': '2804704', 'title': 'Gone with the Wind (film)', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 43, 'bleu_score': 0.6147881529512641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8129554431037634868}, 'section': 'Section::::Cast.\n'}]}]