Question: who was nominated for best actress this year
[{'answer': 'Sally Hawkins'}, {'answer': 'Margot Robbie'}, {'answer': 'Saoirse Ronan'}, {'answer': 'Meryl Streep', 'provenance': [{'wikipedia_id': '23245556', 'title': 'Academy Award for Best Actress', 'start_paragraph_id': 3, 'start_character': 501, 'end_paragraph_id': 3, 'end_character': 513, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]