Question: when did french become official language of canada
[{'answer': 'September 9 , 1969', 'provenance': [{'wikipedia_id': '466603', 'title': 'Official Languages Act (Canada)', 'start_paragraph_id': 1, 'start_character': 125, 'end_paragraph_id': 1, 'end_character': 143, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '466603', 'title': 'Official Languages Act (Canada)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 602, 'bleu_score': 0.9638930762749001, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11156777119135216024}, 'section': 'Section::::Abstract.'}]}]