Question: when did vietnam become part of the french empire
[{'answer': '1887', 'provenance': [{'wikipedia_id': '52053', 'title': 'French Indochina', 'start_paragraph_id': 1, 'start_character': 244, 'end_paragraph_id': 1, 'end_character': 248, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '52053', 'title': 'French Indochina', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 365, 'bleu_score': 0.968982777549629, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14912555780764030363}, 'section': 'Section::::Abstract.'}]}]