Question: who won the first oscar for best actress
[{'answer': 'Janet Gaynor', 'provenance': [{'wikipedia_id': '23245556', 'title': 'Academy Award for Best Actress', 'start_paragraph_id': 2, 'start_character': 54, 'end_paragraph_id': 2, 'end_character': 66, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23245556', 'title': 'Academy Award for Best Actress', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 764, 'bleu_score': 0.9661808264736941, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10041427541003412208}, 'section': 'Section::::Abstract.'}]}]