Question: when did the last episode of seinfeld air
[{'answer': 'May 14 , 1998', 'provenance': [{'wikipedia_id': '5175103', 'title': 'The Finale (Seinfeld)', 'start_paragraph_id': 1, 'start_character': 218, 'end_paragraph_id': 1, 'end_character': 233, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5175103', 'title': 'The Finale (Seinfeld)', 'start_paragraph_id': 1, 'start_character': 5, 'end_paragraph_id': 1, 'end_character': 319, 'bleu_score': 0.909628052815007, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16266582412631609937}, 'section': 'Section::::Abstract.'}]}]