Question: who won the most oscars for best director
[{'answer': 'John Ford', 'provenance': [{'wikipedia_id': '62009', 'title': 'Academy Award for Best Director', 'start_paragraph_id': 4, 'start_character': 82, 'end_paragraph_id': 4, 'end_character': 91, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]