Question: what's the tallest building in st louis
[{'answer': 'Gateway Arch', 'provenance': [{'wikipedia_id': '15109336', 'title': 'List of tallest buildings in St. Louis', 'start_paragraph_id': 1, 'start_character': 58, 'end_paragraph_id': 1, 'end_character': 70, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '15109336', 'title': 'List of tallest buildings in St. Louis', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 218, 'bleu_score': 0.689836378159368, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14188255724152912629}, 'section': 'Section::::Abstract.'}]}]