Question: who holds the record for most digits of pi memorized
[{'answer': 'Haraguchi', 'provenance': [{'wikipedia_id': '3135619', 'title': 'Akira Haraguchi', 'start_paragraph_id': 0, 'start_character': 6, 'end_paragraph_id': 0, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3135619', 'title': 'Akira Haraguchi', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 519, 'bleu_score': 0.6239226713395101, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17368075750307836769}, 'section': 'Section::::Memorization of pi.\n'}]}]