Question: who is the chief justice of nigeria today
[{'answer': 'Walter Samuel Nkanu Onnoghen', 'provenance': [{'wikipedia_id': '11059198', 'title': 'Chief Justice of Nigeria', 'start_paragraph_id': 1, 'start_character': 440, 'end_paragraph_id': 1, 'end_character': 468, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]