Question: which body part does surpankha derive her name
[{'answer': 'fingernails', 'provenance': [{'wikipedia_id': '4002839', 'title': 'Shurpanakha', 'start_paragraph_id': 1, 'start_character': 67, 'end_paragraph_id': 1, 'end_character': 78, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4002839', 'title': 'Shurpanakha', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 362, 'bleu_score': 0.962600167205617, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9019356077726144357}, 'section': 'Section::::Abstract.'}]}]