Question: which animal is the carrier of the h1n1 virus
[{'answer': 'pigs'}, {'answer': 'Pig', 'provenance': [{'wikipedia_id': '1516915', 'title': 'Swine influenza', 'start_paragraph_id': 8, 'start_character': 671, 'end_paragraph_id': 8, 'end_character': 674, 'bleu_score': 1.0, 'section': 'Section::::Signs and symptoms.\n'}]}, {'provenance': [{'wikipedia_id': '1516915', 'title': 'Swine influenza', 'start_paragraph_id': 94, 'start_character': 0, 'end_paragraph_id': 94, 'end_character': 402, 'bleu_score': 0.970795021215021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9438061571183706134}, 'section': 'Section::::History.:H1N1 virus pandemic history.\n'}]}, {}, {'provenance': [{'wikipedia_id': '3843581', 'title': 'Influenza A virus subtype H7N7', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['H7N7 is a subtype of Influenza A virus, a genus of Orthomyxovirus, the viruses responsible for influenza. Highly pathogenic strains (HPAI) and low pathogenic strains (LPAI) exist. H7N7 can infect humans, birds, pigs, seals, and horses in the wild; and has infected mice in laboratory studies. This unusual zoonotic potential represents a pandemic threat.', 'H7N7 is a subtype of Influenza A virus, a genus of Orthomyxovirus, the viruses responsible for influenza. Highly pathogenic strains (HPAI) and low pathogenic strains (LPAI) exist']}}]}]