Question: who is the current chief of defense staff in ghana
[{'answer': 'Lt. Gen. Obed Akwa', 'provenance': [{'wikipedia_id': '11655328', 'title': 'Chief of the Defence Staff (Ghana)', 'start_paragraph_id': 3, 'start_character': 19, 'end_paragraph_id': 3, 'end_character': 37, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '11655328', 'title': 'Chief of the Defence Staff (Ghana)', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 180, 'bleu_score': 0.943604326170661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3952521438289721078}, 'section': 'Section::::Abstract.'}]}]