Question: who plays the voice of darth vader in star wars
[{'answer': 'James Earl Jones', 'provenance': [{'wikipedia_id': '18622049', 'title': 'James Earl Jones', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18622049', 'title': 'James Earl Jones', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 767, 'bleu_score': 0.864495409374036, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2129778101855712337}, 'section': 'Section::::Abstract.'}]}]