Question: how many times has federer won french open
[{'answer': 'one', 'provenance': [{'wikipedia_id': '262376', 'title': 'Roger Federer', 'start_paragraph_id': 2, 'start_character': 141, 'end_paragraph_id': 2, 'end_character': 144, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]