Question: who won best pop vocal album grammys 2018
[{'answer': 'Ed Sheeran', 'provenance': [{'wikipedia_id': '923814', 'title': 'Grammy Award for Best Pop Vocal Album', 'start_paragraph_id': 42, 'start_character': 12, 'end_paragraph_id': 42, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Artists with multiple nominations.\n'}]}]