Question: what class of vertebrates do seals belong to
[{'answer': 'mammals', 'provenance': [{'wikipedia_id': '60261', 'title': 'Pinniped', 'start_paragraph_id': 1, 'start_character': 126, 'end_paragraph_id': 1, 'end_character': 133, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '60261', 'title': 'Pinniped', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 833, 'bleu_score': 0.929319350025086, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4188516403437708817}, 'section': 'Section::::Abstract.'}]}]