Question: what is the undertaker's record in wrestlemania
[{'answer': '21 straight victories', 'provenance': [{'wikipedia_id': '44830459', 'title': 'The Streak (wrestling)', 'start_paragraph_id': 1, 'start_character': 27, 'end_paragraph_id': 1, 'end_character': 48, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '44830459', 'title': 'The Streak (wrestling)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 816, 'bleu_score': 0.9666817114186481, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8627926597443391186}, 'section': 'Section::::Abstract.'}]}]