Question: who plays sarah on dc legends of tomorrow
[{'answer': 'Caity Lotz', 'provenance': [{'wikipedia_id': '46299779', 'title': 'Legends of Tomorrow', 'start_paragraph_id': 30, 'start_character': 672, 'end_paragraph_id': 30, 'end_character': 682, 'bleu_score': 1.0, 'section': 'Section::::Production.:Development.\n'}]}]