Question: who has won the rugby league challenge cup the most times
[{'answer': 'Wigan', 'provenance': [{'wikipedia_id': '21050680', 'title': 'Challenge Cup', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 5, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]