Question: who finished the dark knight as the joker
[{'answer': 'Ledger', 'provenance': [{'wikipedia_id': '17173785', 'title': 'Heath Ledger', 'start_paragraph_id': 0, 'start_character': 6, 'end_paragraph_id': 0, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '17173785', 'title': 'Heath Ledger', 'start_paragraph_id': 67, 'start_character': 0, 'end_paragraph_id': 67, 'end_character': 747, 'bleu_score': 0.985238839858627, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4537913403248663083}, 'section': 'Section::::Legacy.:Posthumous films and awards.\n'}]}]