Question: who did the texans select to lead the volunteer army
[{'answer': 'Houston', 'provenance': [{'wikipedia_id': '60024', 'title': 'Sam Houston', 'start_paragraph_id': 0, 'start_character': 4, 'end_paragraph_id': 0, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]