Question: who freed helen when she was kidnapped by theseus
[{'answer': 'Castor and Pollux', 'provenance': [{'wikipedia_id': '63444', 'title': 'Helen of Troy', 'start_paragraph_id': 14, 'start_character': 661, 'end_paragraph_id': 14, 'end_character': 678, 'bleu_score': 1.0, 'section': 'Section::::Life.:Birth.\n'}]}, {'provenance': [{'wikipedia_id': '63444', 'title': 'Helen of Troy', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 745, 'bleu_score': 0.93017597163603, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7053799507873629135}, 'section': 'Section::::Life.:Youthful abduction by Theseus.\n'}]}]