Question: who was the last colonial leader of nigeria before she gained her independence
[{'answer': 'Jaja Wachuku', 'provenance': [{'wikipedia_id': '21384', 'title': 'History of Nigeria', 'start_paragraph_id': 96, 'start_character': 237, 'end_paragraph_id': 96, 'end_character': 249, 'bleu_score': 1.0, 'section': 'Section::::Independence.\n'}]}, {'provenance': [{'wikipedia_id': '21384', 'title': 'History of Nigeria', 'start_paragraph_id': 96, 'start_character': 0, 'end_paragraph_id': 96, 'end_character': 659, 'bleu_score': 0.9802931511945101, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7989836716039524483}, 'section': 'Section::::Independence.\n'}]}]