Question: who plays helena cassa dine on general hospital
[{'answer': 'Constance Towers', 'provenance': [{'wikipedia_id': '5884997', 'title': 'Helena Cassadine', 'start_paragraph_id': 1, 'start_character': 208, 'end_paragraph_id': 1, 'end_character': 224, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5884997', 'title': 'Helena Cassadine', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 381, 'bleu_score': 0.9679895851501501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11373754190805351458}, 'section': 'Section::::Abstract.'}]}]