Question: who won the 2018 world's strongest man competition
[{'answer': 'Hafþór Júlíus Björnsson', 'provenance': [{'wikipedia_id': '57365769', 'title': "2018 World's Strongest Man", 'start_paragraph_id': 3, 'start_character': 106, 'end_paragraph_id': 3, 'end_character': 129, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '57365769', 'title': "2018 World's Strongest Man", 'start_paragraph_id': 3, 'start_character': 31, 'end_paragraph_id': 3, 'end_character': 430, 'bleu_score': 0.5477512600841681, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2934421052433943213}, 'section': 'Section::::Abstract.'}]}]