Question: who won wwe universal championship in royal rumble 2018
[{'answer': 'AJ Styles', 'provenance': [{'wikipedia_id': '52993846', 'title': 'Royal Rumble (2018)', 'start_paragraph_id': 2, 'start_character': 492, 'end_paragraph_id': 2, 'end_character': 501, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '52993846', 'title': 'Royal Rumble (2018)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 758, 'bleu_score': 0.9480485738483061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7380441548868721012}, 'section': 'Section::::Abstract.'}]}]