Question: what is the area code for dallas tx
[{'answer': '214', 'provenance': [{'wikipedia_id': '4606627', 'title': 'Area codes 214, 469, and 972', 'start_paragraph_id': 0, 'start_character': 11, 'end_paragraph_id': 0, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '469', 'provenance': [{'wikipedia_id': '4606627', 'title': 'Area codes 214, 469, and 972', 'start_paragraph_id': 0, 'start_character': 16, 'end_paragraph_id': 0, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '972', 'provenance': [{'wikipedia_id': '4606627', 'title': 'Area codes 214, 469, and 972', 'start_paragraph_id': 0, 'start_character': 25, 'end_paragraph_id': 0, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4606627', 'title': 'Area codes 214, 469, and 972', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 158, 'bleu_score': 0.929712191543383, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2309234016523658726}, 'section': 'Section::::Abstract.'}]}]