Question: who played the mayor of munchkinland in the wizard of oz
[{'answer': 'Karl Becker', 'provenance': [{'wikipedia_id': '23631135', 'title': 'Charlie Becker', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23631135', 'title': 'Charlie Becker', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 275, 'bleu_score': 0.959574895300321, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13335388274764088512}, 'section': 'Section::::Abstract.'}]}]