Question: who won the world junior hockey championship 2018
[{'answer': 'Canada', 'provenance': [{'wikipedia_id': '41679131', 'title': '2018 World Junior Ice Hockey Championships', 'start_paragraph_id': 2, 'start_character': 33, 'end_paragraph_id': 2, 'end_character': 39, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]