Question: when was the first documented case of aids in the united states
[{'answer': '1977', 'provenance': [{'wikipedia_id': '1867307', 'title': 'Timeline of HIV/AIDS', 'start_paragraph_id': 22, 'start_character': 12, 'end_paragraph_id': 22, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::Pre-1980s.\n'}]}, {'provenance': [{'wikipedia_id': '1867307', 'title': 'Timeline of HIV/AIDS', 'start_paragraph_id': 24, 'start_character': 50, 'end_paragraph_id': 24, 'end_character': 315, 'bleu_score': 0.8858760793628371, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12653558730067262989}, 'section': 'Section::::Pre-1980s.\n'}]}]