Question: who played luke mcdonald in the movie el dorado
[{'answer': 'Johnny Crawford', 'provenance': [{'wikipedia_id': '1346469', 'title': 'El Dorado (1966 film)', 'start_paragraph_id': 27, 'start_character': 12, 'end_paragraph_id': 27, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}, {'provenance': [{'wikipedia_id': '1346469', 'title': 'El Dorado (1966 film)', 'start_paragraph_id': 27, 'start_character': 0, 'end_paragraph_id': 27, 'end_character': 45, 'bleu_score': 0.6147881529512641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7788619805730287669}, 'section': 'Section::::Cast.\n'}]}]