Question: how much did mgm national harbor cost to build
[{'answer': 'US $1.4 billion'}, {'provenance': [{'wikipedia_id': '49617754', 'title': 'MGM National Harbor', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 153, 'bleu_score': 0.776514504096765, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16749114784990519095}, 'section': 'Section::::Abstract.'}]}]