Question: who played bert in the big bang theory
[{'answer': 'Posehn', 'provenance': [{'wikipedia_id': '2434904', 'title': 'Brian Posehn', 'start_paragraph_id': 0, 'start_character': 6, 'end_paragraph_id': 0, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2434904', 'title': 'Brian Posehn', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 1636, 'bleu_score': 0.9541108312341381, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 880974297941468158}, 'section': 'Section::::Career.:Television work.\n'}]}]