Question: the infectious agent that causes aids is a(n)
[{'answer': 'virus', 'provenance': [{'wikipedia_id': '5069516', 'title': 'HIV/AIDS', 'start_paragraph_id': 1, 'start_character': 23, 'end_paragraph_id': 1, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5069516', 'title': 'HIV/AIDS', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 800, 'bleu_score': 0.939516250852901, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15116660003203704004}, 'section': 'Section::::Abstract.'}]}]