Question: when was hiv first identified in the united states
[{'answer': '1959', 'provenance': [{'wikipedia_id': '1867307', 'title': 'Timeline of HIV/AIDS', 'start_paragraph_id': 7, 'start_character': 12, 'end_paragraph_id': 7, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::Pre-1980s.\n'}]}, {'provenance': [{'wikipedia_id': '1867307', 'title': 'Timeline of HIV/AIDS', 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 423, 'bleu_score': 0.944041853942402, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7353716538826682587}, 'section': 'Section::::Pre-1980s.\n'}]}]