Question: when did vietnam first became a colony of france
[{'answer': 'in 1887'}, {'provenance': [{'wikipedia_id': '19201122', 'title': 'France–Vietnam relations', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 449, 'bleu_score': 0.6210973903927041, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10658482598112651884}, 'section': 'Section::::Abstract.'}]}]