Question: who is captain of croatia football team 2018
[{'answer': 'Luka Modrić', 'provenance': [{'wikipedia_id': '715240', 'title': 'Croatia national football team', 'start_paragraph_id': 2, 'start_character': 956, 'end_paragraph_id': 2, 'end_character': 967, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]