Question: when did french stop being the official language of england
[{'answer': 'the 15th century', 'provenance': [{'wikipedia_id': '11292933', 'title': 'Anglo-Norman language', 'start_paragraph_id': 2, 'start_character': 572, 'end_paragraph_id': 2, 'end_character': 588, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '11292933', 'title': 'Anglo-Norman language', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 846, 'bleu_score': 0.985964042079227, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7263117755976879950}, 'section': 'Section::::Abstract.'}]}]