Question: who plays sara lance in dc legends of tomorrow
[{'answer': 'Caity Lotz', 'provenance': [{'wikipedia_id': '45244123', 'title': 'Sara Lance', 'start_paragraph_id': 1, 'start_character': 598, 'end_paragraph_id': 1, 'end_character': 608, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]