Question: how tall is the tallest building in las vegas
[{'answer': 'The Drew Las Vegas', 'provenance': [{'wikipedia_id': '13065408', 'title': 'List of tallest buildings in Las Vegas', 'start_paragraph_id': 1, 'start_character': 486, 'end_paragraph_id': 1, 'end_character': 504, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1,149 feet'}, {'answer': '642 feet ( 196 m )'}, {'answer': '735 feet ( 224 m )'}, {'provenance': [{'wikipedia_id': '13065408', 'title': 'List of tallest buildings in Las Vegas', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 755, 'bleu_score': 0.7613975804930201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1597745571203556410}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '13065408', 'title': 'List of tallest buildings in Las Vegas', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The tallest building in Las Vegas is The Drew Las Vegas, which rises and was topped out in November 2008.', 'The tallest building in Las Vegas is The Drew Las Vegas, which rises and was topped out in November 2008.', 'The tallest building in Las Vegas is The Drew Las Vegas']}}]}]