Question: where is billboard music awards 2018 held at
[{'answer': 'MGM Grand Garden Arena', 'provenance': [{'wikipedia_id': '57024174', 'title': '2018 Billboard Music Awards', 'start_paragraph_id': 1, 'start_character': 60, 'end_paragraph_id': 1, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Las Vegas , Nevada'}]