Question: when did french become canada's second language
[{'answer': '1867', 'provenance': [{'wikipedia_id': '1555010', 'title': 'Official bilingualism in Canada', 'start_paragraph_id': 19, 'start_character': 272, 'end_paragraph_id': 19, 'end_character': 276, 'bleu_score': 1.0, 'section': 'Section::::History.:Before confederation.:International auxiliary languages.\n'}]}, {'provenance': [{'wikipedia_id': '1555010', 'title': 'Official bilingualism in Canada', 'start_paragraph_id': 38, 'start_character': 0, 'end_paragraph_id': 38, 'end_character': 1317, 'bleu_score': 0.9575302152977601, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16299386486230956160}, 'section': 'Section::::Constitutional provisions on official languages.:Constitution Act, 1867 (section 133).\n'}]}]