Question: who played the joker in the batman tv series
[{'answer': 'Cesar Romero', 'provenance': [{'wikipedia_id': '298705', 'title': 'Batman (TV series)', 'start_paragraph_id': 19, 'start_character': 12, 'end_paragraph_id': 19, 'end_character': 24, 'bleu_score': 1.0, 'section': 'Section::::Cast.:Recurring villains.\n'}]}, {'provenance': [{'wikipedia_id': '298705', 'title': 'Batman (TV series)', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 175, 'bleu_score': 0.8446593249975181, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6842434505211424391}, 'section': 'Section::::Cast.:Recurring villains.\n'}]}]