Question: who is the city of houston named after
[{'answer': 'former General Sam Houston', 'provenance': [{'wikipedia_id': '13774', 'title': 'Houston', 'start_paragraph_id': 3, 'start_character': 234, 'end_paragraph_id': 3, 'end_character': 260, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]