Question: who played luke skywalker in a new hope
[{'answer': 'Mark Richard Hamill', 'provenance': [{'wikipedia_id': '18617682', 'title': 'Mark Hamill', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]