Question: when did the first episode of critical role air
[{'answer': 'March 12 , 2015 .', 'provenance': [{'wikipedia_id': '49082473', 'title': 'Critical Role', 'start_paragraph_id': 38, 'start_character': 610, 'end_paragraph_id': 38, 'end_character': 626, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'provenance': [{'wikipedia_id': '49082473', 'title': 'Critical Role', 'start_paragraph_id': 38, 'start_character': 0, 'end_paragraph_id': 38, 'end_character': 624, 'bleu_score': 0.5589794013887941, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13526916558533517888}, 'section': 'Section::::Background.\n'}]}]