Question: who plays olivia benson on law and order
[{'answer': 'Mariska Magdolna Hargitay', 'provenance': [{'wikipedia_id': '429643', 'title': 'Mariska Hargitay', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]