Question: is it head to head or goal difference world cup
[{'answer': 'goal difference', 'provenance': [{'wikipedia_id': '29856514', 'title': '2018 FIFA World Cup qualification', 'start_paragraph_id': 20, 'start_character': 21, 'end_paragraph_id': 20, 'end_character': 36, 'bleu_score': 1.0, 'section': 'Section::::Format.:Tiebreakers.\n'}]}]