Question: who has won the most club world cups
[{'answer': 'Barcelona', 'provenance': [{'wikipedia_id': '1248592', 'title': 'FIFA Club World Cup', 'start_paragraph_id': 25, 'start_character': 238, 'end_paragraph_id': 25, 'end_character': 247, 'bleu_score': 1.0, 'section': 'Section::::History.:Play-off tournaments (2005–2020).\n'}]}, {'provenance': [{'wikipedia_id': '1248592', 'title': 'FIFA Club World Cup', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 264, 'bleu_score': 0.8034512038068881, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4852139041740967319}, 'section': 'Section::::Abstract.'}]}]