Question: when was the last episode of mash aired
[{'answer': 'February 28 , 1983', 'provenance': [{'wikipedia_id': '2188010', 'title': 'Goodbye, Farewell and Amen', 'start_paragraph_id': 1, 'start_character': 216, 'end_paragraph_id': 1, 'end_character': 234, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2188010', 'title': 'Goodbye, Farewell and Amen', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 378, 'bleu_score': 0.8867056754400091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8372717268509986060}, 'section': 'Section::::Abstract.'}]}]