Question: when did lagos become a colony of britain
[{'answer': '5 March 1862', 'provenance': [{'wikipedia_id': '31869205', 'title': 'Lagos Colony', 'start_paragraph_id': 1, 'start_character': 524, 'end_paragraph_id': 1, 'end_character': 536, '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': 8555725584073498629}, 'section': 'Section::::Abstract.'}]}]