Question: who has the most shutouts in mlb history
[{'answer': 'Walter Johnson', 'provenance': [{'wikipedia_id': '27917534', 'title': 'List of Major League Baseball annual shutout leaders', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '27917534', 'title': 'List of Major League Baseball annual shutout leaders', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 950, 'bleu_score': 0.8101157900982431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8810105717435223998}, 'section': 'Section::::Abstract.'}]}]