Question: what was the joker's real name in batman
[{'answer': 'Red Hood', 'provenance': [{'wikipedia_id': '98301', 'title': 'Joker (character)', 'start_paragraph_id': 18, 'start_character': 371, 'end_paragraph_id': 18, 'end_character': 379, 'bleu_score': 1.0, 'section': 'Section::::Creation and development.:Silver Age.\n'}]}, {'provenance': [{'wikipedia_id': '98301', 'title': 'Joker (character)', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 443, 'bleu_score': 0.9738505480425671, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5216567256036646253}, 'section': 'Section::::Creation and development.:Silver Age.\n'}]}]