Question: when was lagos annexed by the colonial masters
[{'answer': '6 August 1861', 'provenance': [{'wikipedia_id': '31869205', 'title': 'Lagos Colony', 'start_paragraph_id': 1, 'start_character': 130, 'end_paragraph_id': 1, 'end_character': 143, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '31869205', 'title': 'Lagos Colony', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 536, 'bleu_score': 0.504196008544975, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10154203167906656099}, 'section': 'Section::::Abstract.'}]}]