Question: who plays cassie blake in the secret circle
[{'answer': 'Britt Robertson', 'provenance': [{'wikipedia_id': '31050747', 'title': 'The Secret Circle (TV series)', 'start_paragraph_id': 4, 'start_character': 49, 'end_paragraph_id': 4, 'end_character': 64, 'bleu_score': 1.0, 'section': 'Section::::Synopsis.\n'}]}, {'provenance': [{'wikipedia_id': '31050747', 'title': 'The Secret Circle (TV series)', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 1056, 'bleu_score': 0.9892179350238061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16354204224443091563}, 'section': 'Section::::Synopsis.\n'}]}]