Question: when did the last episode of scandal air
[{'answer': 'April 19 , 2018', 'provenance': [{'wikipedia_id': '34702540', 'title': 'List of Scandal episodes', 'start_paragraph_id': 1, 'start_character': 129, 'end_paragraph_id': 1, 'end_character': 144, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]