Question: when was the last episode of lost aired
[{'answer': 'May 23 , 2010', 'provenance': [{'wikipedia_id': '26688484', 'title': 'The End (Lost)', 'start_paragraph_id': 22, 'start_character': 319, 'end_paragraph_id': 22, 'end_character': 332, 'bleu_score': 1.0, 'section': 'Section::::Broadcasting.\n'}]}]