Question: what is the snakes name from harry potter
[{'answer': 'Nagini', 'provenance': [{'wikipedia_id': '44331', 'title': 'Severus Snape', 'start_paragraph_id': 31, 'start_character': 327, 'end_paragraph_id': 31, 'end_character': 333, 'bleu_score': 1.0, 'section': 'Section::::Appearances.:"Harry Potter and the Deathly Hallows".\n'}]}, {'provenance': [{'wikipedia_id': '44331', 'title': 'Severus Snape', 'start_paragraph_id': 31, 'start_character': 0, 'end_paragraph_id': 31, 'end_character': 497, 'bleu_score': 0.977397480575333, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16225225436548942545}, 'section': 'Section::::Appearances.:"Harry Potter and the Deathly Hallows".\n'}]}]