Question: what are the snakes names in rikki tikki tavi
[{'answer': 'Nag', 'provenance': [{'wikipedia_id': '30863573', 'title': 'Rikki-Tikki-Tavi', 'start_paragraph_id': 3, 'start_character': 305, 'end_paragraph_id': 3, 'end_character': 308, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}, {'answer': 'Nagaina', 'provenance': [{'wikipedia_id': '30863573', 'title': 'Rikki-Tikki-Tavi', 'start_paragraph_id': 3, 'start_character': 313, 'end_paragraph_id': 3, 'end_character': 320, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}]