Question: what is the name of the white dragon in merlin
[{'answer': 'Aithusa', 'provenance': [{'wikipedia_id': '19408793', 'title': 'List of Merlin characters', 'start_paragraph_id': 9, 'start_character': 11, 'end_paragraph_id': 9, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::A.:Agravaine de Bois.\n'}]}, {'provenance': [{'wikipedia_id': '19408793', 'title': 'List of Merlin characters', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 1872, 'bleu_score': 0.9941775218333431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13651634741635989148}, 'section': 'Section::::A.:Aithusa.\n'}]}]