Question: who is hosting the 2018 olympics for nbc
[{'answer': 'Mike Tirico', 'provenance': [{'wikipedia_id': '21832516', 'title': 'Olympics on NBC commentators', 'start_paragraph_id': 182, 'start_character': 12, 'end_paragraph_id': 182, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::By event.:Summer Olympics.:2016.:2016 Sportsdesk Reporters.\n'}]}, {'answer': 'Rebecca Lowe', 'provenance': [{'wikipedia_id': '21832516', 'title': 'Olympics on NBC commentators', 'start_paragraph_id': 56, 'start_character': 12, 'end_paragraph_id': 56, 'end_character': 24, 'bleu_score': 1.0, 'section': 'Section::::By event.:2014.:2014 Olympic studio hosts.\n'}]}]