Question: where does the word cul de sac come from
[{'answer': 'French', 'provenance': [{'wikipedia_id': '390697', 'title': 'Dead end (street)', 'start_paragraph_id': 1, 'start_character': 47, 'end_paragraph_id': 1, 'end_character': 53, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]