Question: who's won the european cup the most times
[{'answer': 'Real Madrid', 'provenance': [{'wikipedia_id': '2947773', 'title': 'European Cup and UEFA Champions League records and statistics', 'start_paragraph_id': 4, 'start_character': 75, 'end_paragraph_id': 4, 'end_character': 86, 'bleu_score': 1.0, 'section': 'Section::::General performances.:By club.\n'}]}, {'provenance': [{'wikipedia_id': '2947773', 'title': 'European Cup and UEFA Champions League records and statistics', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 535, 'bleu_score': 0.920196768361172, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4503382939024817022}, 'section': 'Section::::General performances.:By club.\n'}]}]