Question: where is the world cup final being held
[{'answer': 'Luzhniki Stadium in Moscow', 'provenance': [{'wikipedia_id': '13327177', 'title': '2018 FIFA World Cup', 'start_paragraph_id': 3, 'start_character': 39, 'end_paragraph_id': 3, 'end_character': 65, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]