Question: who is doing the halftime show for the 2018 super bowl
[{'answer': 'Justin Timberlake', 'provenance': [{'wikipedia_id': '45280353', 'title': 'Super Bowl LII halftime show', 'start_paragraph_id': 1, 'start_character': 200, 'end_paragraph_id': 1, 'end_character': 217, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]