Question: who won usa vs the world ninja warrior 2018
[{'answer': 'Team Europe', 'provenance': [{'wikipedia_id': '23788991', 'title': 'American Ninja Warrior', 'start_paragraph_id': 64, 'start_character': 238, 'end_paragraph_id': 64, 'end_character': 249, 'bleu_score': 1.0, 'section': 'Section::::Special episodes.:"USA vs. The World".\n'}]}]