Question: who was the first missing person on a milk carton
[{'answer': 'Etan Kalil Patz', 'provenance': [{'wikipedia_id': '2209444', 'title': 'Disappearance of Etan Patz', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2209444', 'title': 'Disappearance of Etan Patz', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 680, 'bleu_score': 0.7533497886208911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16250545097895155216}, 'section': 'Section::::Abstract.'}]}]