Question: who has the most hat tricks in champions league
[{'answer': 'Cristiano Ronaldo', 'provenance': [{'wikipedia_id': '41532657', 'title': 'List of UEFA Champions League hat-tricks', 'start_paragraph_id': 2, 'start_character': 403, 'end_paragraph_id': 2, 'end_character': 420, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Messi', 'provenance': [{'wikipedia_id': '41532657', 'title': 'List of UEFA Champions League hat-tricks', 'start_paragraph_id': 2, 'start_character': 80, 'end_paragraph_id': 2, 'end_character': 85, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '41532657', 'title': 'List of UEFA Champions League hat-tricks', 'start_paragraph_id': 3, 'start_character': 142, 'end_paragraph_id': 3, 'end_character': 980, 'bleu_score': 0.695165799048577, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13601013496636467191}, 'section': 'Section::::Abstract.'}]}]