Question: who played callen's girlfriend on ncis la
[{'answer': 'Kristen Donnelly'}, {'answer': 'Joelle Taylor', 'provenance': [{'wikipedia_id': '28976713', 'title': 'G. Callen', 'start_paragraph_id': 30, 'start_character': 76, 'end_paragraph_id': 30, 'end_character': 89, 'bleu_score': 1.0, 'section': 'Section::::Storylines.:Season 5.\n'}]}, {'answer': 'Anna Kolcheck'}]