Question: which club is the highest champions league winner
[{'answer': 'Real Madrid', 'provenance': [{'wikipedia_id': '19012416', 'title': 'List of UEFA club competition winners', 'start_paragraph_id': 2, 'start_character': 13, 'end_paragraph_id': 2, 'end_character': 24, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19012416', 'title': 'List of UEFA club competition winners', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 547, 'bleu_score': 0.8156464139999681, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13985508506045176900}, 'section': 'Section::::Winners.:By club.\n'}]}]