Question: who played bert on the big bang theory
[{'answer': 'Brian Edmund Posehn', 'provenance': [{'wikipedia_id': '2434904', 'title': 'Brian Posehn', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2434904', 'title': 'Brian Posehn', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 310, 'bleu_score': 0.9468812661363221, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12746394135058141598}, 'section': 'Section::::Abstract.'}]}]