Question: when did brock lesnar beat undertaker at wrestlemania
[{'answer': '2014', 'provenance': [{'wikipedia_id': '44830459', 'title': 'The Streak (wrestling)', 'start_paragraph_id': 2, 'start_character': 319, 'end_paragraph_id': 2, 'end_character': 323, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '44830459', 'title': 'The Streak (wrestling)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 360, 'bleu_score': 0.873973854458407, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10913879058104760353}, 'section': 'Section::::Abstract.'}]}]