Question: when did the first star wars movie air
[{'answer': 'May 25 , 1977', 'provenance': [{'wikipedia_id': '26678', 'title': 'Star Wars', 'start_paragraph_id': 17, 'start_character': 28, 'end_paragraph_id': 17, 'end_character': 44, 'bleu_score': 1.0, 'section': 'Section::::Film.:Skywalker saga.:Original trilogy.\n'}]}]