Question: who threw the most no hitters in mlb history
[{'answer': 'Nolan Ryan', 'provenance': [{'wikipedia_id': '329902', 'title': 'No-hitter', 'start_paragraph_id': 12, 'start_character': 60, 'end_paragraph_id': 12, 'end_character': 70, 'bleu_score': 1.0, 'section': 'Section::::Major League Baseball no-hitters.:Frequency.:Individual.\n'}]}, {'provenance': [{'wikipedia_id': '329902', 'title': 'No-hitter', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 612, 'bleu_score': 0.9832621206481431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6963956553408163914}, 'section': 'Section::::Major League Baseball no-hitters.:Frequency.:Individual.\n'}]}]