Question: who was the first elected president of the republic of texas
[{'answer': 'Sam Houston', 'provenance': [{'wikipedia_id': '809226', 'title': 'President of the Republic of Texas', 'start_paragraph_id': 4, 'start_character': 351, 'end_paragraph_id': 4, 'end_character': 362, 'bleu_score': 1.0, 'section': 'Section::::History and duties.\n'}]}]