Question: who has won the most grand finals in rugby league
[{'answer': 'Leeds Rhinos', 'provenance': [{'wikipedia_id': '4932384', 'title': 'Super League Grand Final', 'start_paragraph_id': 5, 'start_character': 52, 'end_paragraph_id': 5, 'end_character': 64, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]