Question: who plays the joker in the lego batman movie
[{'answer': 'Zach Galifianakis', 'provenance': [{'wikipedia_id': '44079493', 'title': 'The Lego Batman Movie', 'start_paragraph_id': 1, 'start_character': 808, 'end_paragraph_id': 1, 'end_character': 825, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '44079493', 'title': 'The Lego Batman Movie', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 42, 'bleu_score': 0.6147881529512641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12303224351041346168}, 'section': 'Section::::Voice Cast.\n'}]}]