Question: when was star wars a new hope called episode 4
[{'answer': '1975', 'provenance': [{'wikipedia_id': '52549', 'title': 'Star Wars (film)', 'start_paragraph_id': 2, 'start_character': 181, 'end_paragraph_id': 2, 'end_character': 185, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]