Question: who has won the most oscars as best actor
[{'answer': 'Daniel Day - Lewis', 'provenance': [{'wikipedia_id': '18739638', 'title': 'List of actors with two or more Academy Awards in acting categories', 'start_paragraph_id': 2, 'start_character': 188, 'end_paragraph_id': 2, 'end_character': 206, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]