Question: who played the ghost of anakin skywalker in episode 6
[{'answer': 'Sebastian Shaw', 'provenance': [{'wikipedia_id': '53736', 'title': 'Hayden Christensen', 'start_paragraph_id': 16, 'start_character': 128, 'end_paragraph_id': 16, 'end_character': 142, 'bleu_score': 1.0, 'section': 'Section::::Career.:1993–2005.:"Star Wars".\n'}]}, {'provenance': [{'wikipedia_id': '53736', 'title': 'Hayden Christensen', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 554, 'bleu_score': 0.979484453366057, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7472773918042300430}, 'section': 'Section::::Career.:1993–2005.:"Star Wars".\n'}]}]