Question: who has won the most ice hockey world championships
[{'answer': 'Canada', 'provenance': [{'wikipedia_id': '17378548', 'title': 'List of IIHF World Championship medalists', 'start_paragraph_id': 2, 'start_character': 1038, 'end_paragraph_id': 2, 'end_character': 1044, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '17378548', 'title': 'List of IIHF World Championship medalists', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 764, 'bleu_score': 0.9495802841119161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3130468651324966248}, 'section': 'Section::::Abstract.'}]}]