Question: who was the leader of the texas rangers
[{'answer': 'Robert McAlpin Williamson', 'provenance': [{'wikipedia_id': '24344298', 'title': 'History of the Texas Ranger Division', 'start_paragraph_id': 6, 'start_character': 590, 'end_paragraph_id': 6, 'end_character': 615, 'bleu_score': 1.0, 'section': 'Section::::Creation and early days.\n'}]}, {'provenance': [{'wikipedia_id': '24344298', 'title': 'History of the Texas Ranger Division', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 725, 'bleu_score': 0.963132435881702, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13500622951019469367}, 'section': 'Section::::Creation and early days.\n'}]}]